He's always been that passionate guy, though. Catalyst doesn't mean the reaction wouldn't have happened... it just pushed things along faster. And he just... he makes these choices in the best hopes, but underestimates how truly awful people can be.

Hah, I just realized I typed 'movie' up there instead of 'move.' *snickers*

Anyway. Gaeta thinks he's calm and rational and intelligent. He is. Until he gets swept away by a powerful emotion. Neck-stabbing with a pen, remember that? And I think he acts under the assumption that he's still calm and rational, even when he's not. Dee's death was a HUGE blow to the rationality. It's only been, what... less than a week? I don't know if we have a timeline for all of this, but he's still in mourning.