In short, because the people I used to play with don't RP. They roll dice and cheer when they blow stuff up.
"Used to" as I just quit an Aberrant game that's been going on for a while now. Several months.
I'm not going to get into the specifics too much, 'cause it's boring and nerdy, and only one side of the story.
Short version:
Group are playing long-term military types that Erupted, and formed a US Gov funded Nova group. One of the chars became psychotic and murderous. Three of the group decided to quit the team and help free said psycho, for no good reason other than it's be fun. Oh, sure, they had their reasons "It's unfair he should be locked up". After he had murdered one of the team *already* and gone at the group on at least one previous occasion.
The remaining 3 (including me), when asked "we're leaving now, we're not telling you where, or why, and there's no discussion. Are you coming?" answered with "um.... no?".
As such, the GM asked at the end of the session which group of chars were getting dumped.
Which is a fair question, as it'd be crap having to run 2 separate sessions a week.
Given that I'm p!ssed at having to dump my char because the moron-brigade couldn't do something reasonable like *resign* (that way the rest of us could join them without having to deal with the attendant BS of working with AWOL Nova-Soldiers), and the other option is to argue the others into dumping their charactors (which isnt' going to happen), I've decided to quit. Either way theres going to be resentment.
And I'd rather resent the stupid motherf*ckers than the other way 'round.......