There is no Mantle at this point and Lash has not yet surfaced although she may be influencing him. He will also go a little crazy at Camp Kaboom. This has been ongoing throughout the series.
Yes, he did, he had just witnessed a couple of teenage warden apprentices being murdered and eaten by Ghouls.. Yeah, it made him a little crazy for a while. You ever see the movie about the war hero Audie Murphy, true story? After his friend was cut down, he went a little nuts too, taking out several German machine gun nests all by himself and he didn't spare anyone. And yes, Harry was under Lasciel's influence then, it was pre-Lash, that is how he could understand the speech of the Ghouls.
I'm suggesting that Jim is writing a character who is an antithesis of who the character professes to be.
I understand what you are suggesting, what I am saying is you are mistaken. Harry has never professed to be a saint, he has made mistakes as we all do.
"No," Ebenezar said. "You've got to breathe, boy. Think."
I started gathering power. "Kill him. Kill him. Everything. All of it. Nothing left."
"Harry," Ebenezar snapped. "Harry, let go. You can't handle that kind of power. You'll kill yourself if you try."
I didn't care about that, either. The power felt too good—too strong. I wanted it. I wanted Raith to pay. I wanted him to suffer, screaming, and then die for what he had done to me. And I was strong enough to make it happen. I had the power and the resolve to bring such a tide of magic against him that he would be utterly destroyed. I would lay him low and make him howl for mercy before I tore him apart. He deserved nothing less.
And then fire blossomed in my hand again, so sudden and sharp that my back convulsed into an agonized arch, and I fell to the floor. I couldn't scream. The pain washed my fury away like dandelions before a flash flood. I looked around wildly and saw the old man's broad, calloused hand clamped down over my burned, lightly bandaged flesh with bruising strength. When he saw my eyes he released my hand, his expression sickened.
Again, this isn't an evil person speaking, nor even a calculating one.. He is injured, quite severely, lots of pain, vulnerable emotionally and he just learned a hell of a lot that he wasn't prepared for. It is revealed to him who murdered his mother. Again, his reaction is very normal. Eb even confesses that he, himself tried to go after Raith, but he couldn't kill him, he is protected. Yes, Harry's thoughts are ugly, violent, but natural that he'd want to go after the person who did it.. I've had those thoughts too, a friend's dog was shot in his own yard by some thrill seekers, jerks. Did I act on those thoughts? No, but let us say I didn't wish whoever did it, well.
If I understand you correctly, you are suggesting Harry's reactions stem from some thing that Justin created, this huge character flaw in Harry. If it is, it is a very human one, no, he isn't a bad man appearing to be good. Your examples do not prove your point.
I wouldn't want to be anywhere near Harry because I'm genre savvy. How many of the people close to him have had horrible fates befall them? A lot of it, most in fact, wasn't Harry's fault. Doesn't change the fact I wouldn't want to be collateral damage. (Technically, only property can be collateral damage. Injury and death is called incidental injury). It's kind of like hanging out with a cartel member. You could end up dead just because you were near them.
Or if you know Harry well at all and profess to be his friend, you know perfectly well if there is a shit fest Harry is going to be in the middle of the cesspool combating it. If you want to be any where near it some of that smelly brown stuff is going to hit you in the process. Yet they do it over and over again.
Yeah, nothing against Harry, but the sensible response to Dresden is to decide, "fuck that, I'm going to move to Europe/Asia/Australia/etc", that should be far enough to avoid the splash zone.
Yeah, yet they do it over and over again and they don't even wear a raincoat..