In the end he hints that killing laroche was not wrong.
but why would he think charlie would, a businessman, would go to this extent to kill laroche? Obviously we know why but the detective doesn't
LaRoche is a monster, a wolf in sheep's clothing. He messed with a lot of people and he doesn't stop because he's psychotic, arrogant & nobody ever has outsmarted him until now. A man like this is a rabid dog looking to take out the world if he has the means to. That arrogance was his weakness.
I'm sure the detective figured that it's highly possible LaRoche may have pushed this clean cut businessman too far and knowing he wouldn't stop until he's in maximum security or killed that a man in Charlie's position says "Enough with this bulls***, time to put the rabid dog down for everyone's sake before he finally ends our lives."
Even the detective wanted the guy dead for the murder of Charlie & the Detective's mutual friend Winston, of course. He gave Charlie a pass because he realized it wasn't Charlie's idea to allow La Roche into his life. La Roche finagled his way into his life only to destroy it one ounce at a time. As a rabid dog & a parasite, he's not worth the legal proceeding needed and Charlie has more important problems to face with his family, so why arrest a vigilante whose will had good intentions.
Because it's too much of a coincidence that Charles is both friends with Winston and happened to kill the person whose gun killed Winston.
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