2. Harry caused Kirby's death in Turn Coat. But for Harry going to Billy's, Kirby wouldn't have been involved. Harry being the "but-for" cause does not make him responsible, either legally or morally. Legally, being the cause in fact if necessary but not sufficient for culpability. I'd say it is the same for morally, but morality is infinitely debatable. That, however, has nothing to do with whether or not Kirby died because Harry withheld information from Billy. I agree with the arguments that he did not and don't think I've seen an argument other than "Billy said so" on the other side.

    “Billy,” I said quietly. “This isn’t stuff you can unlearn. Right now, you’re insulated from the worst of what goes on because you’re . . . I don’t want to be insulting, but you’re a bunch of amateurs without enough of a clue to be a real threat to anyone.”
    His eyes darkened. “Insulated from the worst?” he asked in a quiet, dangerous voice. “Tell that to Kirby. Tell that to Andi.”

Obviously if he has been shielding then from the worst they can't of had any idea that something like the Skinwalker was a possibility.  And if that isn't clear then there is this.
Quote

I pointed a finger at him.  "I don't want it.  I don't wantto drag you into what's going on/  I don't want you walking into more danger and getting hurt."  I sighed.  "But. . .there is a lot at stake, and I think I may need your help."

1) First, that it claims that Harry is the reason for all the nasty stuff happening around him. Whether Harry were around or not, the problems of Storm Front, Fool Moon, Summer Knight, Death Masks, part of Blood Rites, Dead Beat (probably), possibly Proven Guilty (depending on what people's motivations were--we just don't know yet), Turn Coat (although it wouldn't have happened in Chicago), and possibly Cold Days, would still have happened. And most of them would have happened in the same place. So how is Harry considered responsible for bringing down all that trouble onto people?

2)"Everyone around him" is too broad a category. Harry does not owe it to the entire city of Chicago to tell them about the supernatural world. You could as easily claim that Harry owes it to everyone around him to go live as a hermit and never get close to anyone, because trouble might find him and hurt those around him. It's just unreasonable.

This would probably work, except that I tend to think that Harry was too catatonic to be expected to remember it in order to tell Will at the time. Other people may interpret his level of non-functionality differently, however.

"What was that thing?"
"I'm not certain,"  I answered, breathing hard.  Georgia was coming along behind us dragging my staff in her jaws. "But if it is what I think it is, things just got a lot worse."
Billy looked up at me, Kirby's blood all over his face and hands.  "What is it Harry?"
"A Native American nightmare," I said.  I looked at him gravely, "A skinwalker."

I quoted Billy and what he thought about it, not Harry.

They train soldiers so that they pay attention to orders without thinking and practice their responses to the situations that they expect to see in the field.  What they try not to do is let inexperienced people into situations that could kill them with out the knowledge they need to stay alive.  Run through your mind about the type of things Jim has Harry do to Molly that runs along this vain when he acquires Molly as an apprentice.  If he was going to bring Kim or Susan into his realm, he incurred an obligation to give them them that knowledge. 

The point is Susan should have known about the supernatural at all. This is all started when Harry advertise himself as a wizard in the yellow pages. He open the Pandora's box right there. There is a reason why the white council looks poorly about Harry in this matter. It may look innocent at the start, but Harry's advertisement draws amateurs into the the game of supernaturals. All because Harry can't maintain secrecy at the start and fail to fully clued in people when secrecy fails.

They train soldiers so that they pay attention to orders without thinking and practice their responses to the situations that they expect to see in the field.  What they try not to do is let inexperienced people into situations that could kill them with out the knowledge they need to stay alive.  Run through your mind about the type of things Jim has Harry do to Molly that runs along this vain when he acquires Molly as an apprentice.  If he was going to bring Kim or Susan into his realm, he incurred an obligation to give them them that knowledge. 

Look, it's Harry's, he owns it.  He led it to them and it killed them.  They couldn't make an informed choice because he kept them in the dark.  It isn't that they might not die but rather that they didn't fully understand the risks.  And this is true in all the early books, with Kim Delaney and Susan.  Both were foolish, but it's one thing to be foolish and another to be ignorant and foolish.  Turn Coat is the last time it's an issue.  So I'll call it three times, to speak to the OP's point.

He thought it might have made a difference. I just don't see how it would have. The problem is we don't really know that much about how and what the Alphas do. It's mentioned repeatedly how hard it is to impress the dangers of the world on the young, so I'm not sure Harry could have changed anything by informing the Alphas that there are great and terrible powers out there.

I would have insisted on full disclosure if I were Billy too. I'm not a "no questions asked" kind of guy if I'm helping someone do something. It doesn't even have to be a dangerous something.

There's also the semi-apprentice trying to create a cage with runes powerful enough to contain a Loup Garou.

If you steal money while knowing that you did something rong . Even if you return the money afterwards to the last penny, it does not change the fact that you did a crime. It just show that you are remorseful. especially since you only return it after you are asked to do it or even pressured to do it. We may argue that Harry will return Bob voluntarily at the end, but since the text is as it is, we will never know.

"A bit excessive"? It's a clear-cut case of police brutality! It would be bad enough if Murphy did that to someone she didn't know, and that she does it to someone we're supposed to believe she cares about says a lot about her as a person. A suspect is supposed to be arrested, yes, not assaulted when they aren't trying to fight back. And Murphy specifically punches Harry again when he tries to say something, and says "no more talking," so I do not believe she was going to listen to him when they got to the police station--more likely, given her behavior in this scene, she would have just punched him again when he tried to say that he was innocent.