Hmmm I'm half and half on Murphy at the moment but to be honest, it started for me when she became "fun buddies" with a mass murdering mercenary. It seemed like such a hypocrisy.
For people who want to understand how Murphy's outlook has changed over the years, that incident at that time is actually high instructive. It's not precisely hypocritical...because
Karrin was no longer who she had been.
The first few books showed us a Karrin Murphy in denial. She was willing to admit the reality of what she had seen and heard, that the supernatural was real. She was also realistic enough to recognize that it was dangerous, to
really recognize it, I mean, in her guts, which put her one up on Susan, who thought it was all a big game deep down.
But at the same time, she was in denial on two vital levels. She would not admit to herself just how deeply the supernatural
scared her, because Karrin was a person who needed control and the supernatural was uncontrollable. She was smart enough to recognize that uncontrollability, but unable to admit to herself that she feared that. Her fear tended to manifest as short temper and anger.
Related to that was her reliance on the Law as a comfort belief, almost verging on a religious tenet. She desperately wanted to believe in the Law as something that applied to everyone, that protected everyone, that it could encompass the supernatural and that the supernatural could be handled within its framework..which was sheer, unadulterated nonsense. But her fear and need for control and reliance on that comfort belief blocked her from admitting that to herself.
The big blow up came with Ron Carmichael's death, which was very nearly a direct consequence of this self-deception on Murphy's part. After that came a period over a few books where the 'old Karrin' would periodically surface, and get knocked down by reality, and the 'new Karrin', humbler, more realistic, (and a maybe a little more broken) gradually supplanted her.
In
Blood Rites, there's a scene where she and Harry meet Kincaid, that is key to understanding her transition. She and Harry are about to engage in vigilante work, wiping out a scourge of Black Vampires...
and their human thralls. Now, to my knowledge, there's no law against destroying Black Vampires, since the legislators don't believe in them. But killing their thralls, with planning beforehand...that's
Murder One. Think about that for a minute.
Karrin thought about it, and couldn't find a way out. She couldn't protect the public from the vampires without going through the thralls, which meant committing
first degree murder, by definition. The law makes no exceptions for supernatural compulsions. But if she doesn't do it the vampires are going to keep feeding and making new vampires and at least the theoretical potential for an exponential growth curve exists. Mavra probably wouldn't do that, of course, but she could, and even if she didn't her scourge is going to cause tremendous pain, suffering and death.
Murphy had to work with a professional killer who impersonated an officer, because she couldn't do it on her own. She had to engage in multiple major felonies. She hated it, but couldn't find the loophole, because there was no loophole. She even tells Harry about her inner battle.
Murphy: "I'm trying to adjust. In my head, I think what we're doing is just about the only thing we responsibly can. But I've been a peace officer since before I could drink, and this kind of cowboy thing feels...wrong. It isn't what a good cop does."
Harry: "Depends on the cop, I think. Mavra and her scourge are above the law, Murph, in every sense that matters. The only way they're going to get stopped is if someone steps up and takes them down."
<skip a bit>
Murphy: The vampires aren't the problem. I can fight that. Glad to. But there are going to be people around them, too. I don't know if I can pull the trigger when there are going to be people around who could get hurt. I signed on to protect them, not to trap them in a cross-fire."
Harry muses that there wasn't much he could say to that last. Because there isn't. There's no loophole and no way out for Karrin, unless she wants to turn around and walk away. Even then, she'd be committing felonies by not preventing Harry and Kincaid from doing what she knew they intended to do (not that she could realistically stop them, the wheels were turning).
Nor is her reaction unreasonable. A common first step down the road to corruption is rationalization of doing something you know you should not do. That wasn't the case here, the necessity really was what it was, but the pattern of thought is similar.
Just before they struck, the Old Karrin put in a last desperate appearance. She pointed out to Harry that she could arrange to have cops from all over the area descend on the lair of the scourge, hundreds of officers, heavily armed. They could do it legally...but Harry had to point out what would
really happen if they tried that. She can't tell them the truth and if she lies and they cops go in blind, a bunch of good cops die or worse. Further, even if the Law wins the day and wipes out Mavra's scourge and forces her to flee, the supernatural is going to hit back...and when they do, the 'victorious' cops are beyond screwed, and so are their families, their friends, etc. They have neither the knowledge nor the resources to protect themselves.
(Which I suspect is one reason why a lot of the older Council members consider Harry's public stance and involvement with mortal authorities not just unwise, but immoral.)
She can be a cop, but to remain that at heart she must turn her back and walk away from the supernatural entirely, close her eyes. She can fight to protect Chicago from the monsters...but to do so means she's no longer, at heart, really a cop. Being a cop is just her cover, in that case, for her vigilante activities. The conflict tears at who she is, and forces her to become someone else.
Blood Rites is when she makes that transition, after that the Old Karrin occasionally pops up, but never for long and less and less often.
The trip to Hawaii with Kincaid is hypocritical for the old Karrin. It's not for the new one, because the new one isn't a cop anymore, not at heart. It's also a sign that she's accepting that she's no longer who she was. Of course, that's not all of it. It's also about fighting her attraction to Harry and dealing with discovering that her ex-husband is now her brother-in-law and so forth.