Gear my dude.
People wont admit it, but its their precious gear that they don't want to lose. That's the number one thing.
it's the fact that people nowadays are acting like and probably are millennials. They are used to everything going their way, and never any resistance.
So it's hard being held up, in a video game, with imaginary gear, that you can get within minutes again.
Other than that, it might be that they maybe 1 out of 10 times experience some bad hostile rp, and now they focus on that one time, and blame every hostile group for it.