[Stark isn't above killing someone who's pissed him off. But his reasons aren't petty. At least, he doesn't considered a murdered girlfriend to be a petty reason to go after someone. Otherwise though, he keeps it it generally impersonal.]

I kill monsters, not assholes who piss me off. [Though the two aren't mutually exclusive.] Besides, I've had shittier days than this. If I'm going on a murderous rampage, it better be for something bigger than this or else I'm just embarrassing myself.