[Shrug. He doesn't got time to give Keiko the whole sob story, so he waves it off.]

Psychopaths, greedy sons of bitches, mad scientists, people who think 'the greater good' means they get a free pass. All kinds of people can turn out to be monsters. You can never tell, so you gotta be on your guard.

[All this serious talk is getting too close to home, now. He ruffles the back of his hair with a lazy scratching motion.] Just don't trust anybody and you'll be fine.