I think we are operating on wildly different definitions of Integrity then. He had good intentions. Swell. The Road to Hell is paved in them (per WOJ even ). He also attempted to entrap a man who was innocent in the eyes of the Law, just so he could be turned over to monsters and eaten for political expediency, acting out of his own fear and grief.
As I said, his judgement was shot and worthless by that point. But he didn't take the easy way, he did what he thought was right. He was ready to sacrifice a guilty man (as he saw it) for the same reason he was later willing to die for the Council in
Turn Coat, or lie to the Council to protect it from civil war. (Here again, his judgement is at least questionable.)
He fully expected Harry to fall for the trap, because he that's that what the kind of person he thought Harry was would do. Note than when it didn't work, he didn't murder Harry on the spot, or try to. He was just caught off-balance and not sure how to react.
Don't confuse personal integrity with personal morality or good judgement. They are different things. A villain can be heavy with integrity. Marcone has integrity, but that doesn't make him a good guy. Lara has a certain amount of personal integrity, but that doesn't make her less of a monster.
The fact that he personally thought the man was terrible and maybe should die doesnt make any less of a dishonorable act. He was a cop who was trying to plant evidence and frame a suspect.
He didn't think Harryt was terrible, he thought Harry was an iminent threat to the lives and sanity of innocent people and the survival of the Council. It was well beyond 'terrible guy'.
He didn't plant any evidence. Nor did he try to frame Harry. He tried to tempt Harry into stepping over the line, so arguably entrapment, yes.
Harry was, in his own way, doing the
same thing Morgan did when he shot Corpsetaker-in-Luccio later. Harry was lucky/wise enough that it turned out he was right to shoot the woman who he could not really
know was actually Corpsetaker. Even Harry was not 100% sure himself when he
shot the woman in question.