Totally wrong. Wizards do just that; know the rules for magic and use them - that's what the Lore skill does. Harry even comments on it. In addition, Harry has Bob, a spirit of intellect specifically bound by Kemmler to track the rules of magic and serve as an advisor for exactly that kind of thing.
The Lore skill does not tell you the rules.
Nope. That character does not have Thaumaturgy. They got the much more limited Ritual: Voodoo Magic. Someone with Thaumaturgy is like a wizard; they can do Voodoo, summon demons, curse people, pull meteors from the sky, raise the dead, try to become gods, tear holes in the fabric of the universe and whatever else they could possibly imagine. That's another reason why wizards with enough experience to know how to use Thaumaturgy best are terrifyingly powerful.
As others have pointed out, having a motif means you follow it. The results might be the same but the style is different. Can you see Harry ever slitting the throat of a goat? Of course not - his motif is European wizard, not voodoo practitioner. He'd do something else, which mechanically would give him the same bonus, but with a completely different look to his magic.
Again, almost certainly wrong. If you have Recovery, you have probably used it to heal from wounds already. So you already know that you can recover from those wounds or similar and lesser wounds. I mean, if a Lycanthrope recovers from several broken bones or being bitten by a ghoul (i.e. can recover from moderate consequences), a bleeding wound from a knife, being much smaller (a mild consequence) is not going to faze them much.
The character would have to be into pain for it happen. Besides, you are assuming that the PCs KNOW THE RULES!!!!!!!!!
From a PC's point of view, one guy is stabbing another. Knife wounds aren't always the same, especially the ones that require consequences. Sure, we all know that you can take a severe consequence to cancel a single point of stress, but from an in character point of view you are stabbing someone and leaving "Walk it off", "Man, you really should go take care of that/get some rest.”, and “Man, you really need to go to the ER/get serious help.” type damage. You are coming that close to killing someone.
Just for power. You have mentally entered a state you feel that it's okay to almost kill someone because they will get better.
If they find you having bound some people with chains over an altar and are cutting them to fuel your ritual? Sure. If they see you standing with your werewolf buddy and using his blood, willingly given, to fuel said ritual whith the two of you joking about the red robe reccomendation in your book of spells, not really. It is all about context.
You did read that bit where I said that Wardens confused correlation and causation, right?
Okay, let me use one of the most famous examples of that. A while ago they did a study of heroin addicts in prison and discovered that 95% of them had tried weed before going on to heroin. They published the rest that 95% of weed smokers went on to become heroin addicts - which really offended a group of statisticians who did another survey. They found that another substance was much worse because a number approaching 100% of inmates had used it - statistically it was 100%! They then published that study and said since almost 100% of inmates were given milk as children than 100% of those given milk as children would go to prison.
Then they explained the different between correlation and causation. Correlation means that when you look at thing A you usually see thing B. Causation means thing B causes thing A. To get a good percentage of weed smokers who were also on heroin you would need to look at all weed smoker and see how many of them went on to heroin, not ask the heroin addicts if they had ever used weed.
So when the Wardens look at those who break the first law they almost always see someone who had to work up to it so in their minds they see blood magic as the escalation process to murder. They don't see the people who dabble in blood magic and never go further than slicing someone a bit so they assume (falsely) practically everyone who starts with blood magic will end up killing.
In Storm Front, when Morgan has his sword out over Toot-Toot being summoned, Harry doesn't say:
"Check my aura - I don't have Lawbreaking for that law so FU!". No, he has to explain his actions and argue that he hadn't broken the law so shouldn't have his head cut off. If Harry hadn't been able to explain himself then the series would have been much shorter. That's how Wardens work. They see something that they think is wrong and they assume the worse.
It's like if a cop spots someone running in some neighbourhoods they will chase him even though they haven't seen him do anything. They assume that since he's running he must have done something and that's enough for them. A lawyer might argue that running is not suspicious behavour so they had no reason to chase him, but that doesn't stop them from chasing him.
Richard