... You have a point. *thinks* What if he had to learn the hard way that he shouldn't try to change the future? And what if someone knew he could see the future and knew that he had plenty of time to change things... If Perceptor saw someone getting killed (or something similar) and did nothing...

This could be why he keeps to himself most of the time. He doesn't want to get close to someone whose death he'll see and be powerless to prevent.