Well, that was a wisecrack, but we do live in the post-Ace Attorney Mafia era. Even if you are a cop, it doesn't mean that you are not a Serial Killer. Claiming off the bat betrays an ulterior motive, which makes me wary.
Oh, I guess we're doing this now. I think Poltergust is new-ish... Right? Based on the Phoenix Wright comment (Although I guess it has been a year since then)? No Kills are always a bad idea, & you just shouldn't do them. Ever. I'm assuming Squidy's up to shenanigans, but it'd be foolish to rule anything out. Especially since he's usually more the "in your face pressure" type this early in a game.