The argument is that it saves lives. Pre-emptively killing a werewolf that doesn't have any control, it ends there. That werewolf gets loose and attacks people, innocents die or more werewolves are made, which then have to be dealt with too.
He hasn't been around here either, just figured he was working and with you like he'd been before. So he's with that goddamned demon all the time again.
I guessed that might've been a trick you picked up in the past, hence mentioning the best way to hurt her.
I understand it, Faith, it's the same reason I reminded her how things worked. Just be careful in doing it, she's got no qualms about running back to Sam and doing what she has to to make him believe she's innocent and the one who made the threats is just being unfair. After all, that's how you heard about what I did.