Don't forget Brandon Hantz. The only one worse than Colton. Colton was an entitled asshole, but you never got the feeling he'd ever be violent. I think Colton did go into the game intending to compete in genuine, but the first setback he didn't know how to handle it.
I can empathize with Colton a little bit, because I believe the people around him never supported his sexual orientation, so the slightest feeling that he's surrounded by people against him brings up bad memories and puts him in fight or flight mode. So I can forgive him for quitting, but he's still responsible for his treatment of other people.
I wouldn't compare Jackson to either of them in any sense. He's a genuine good guy, who just made a short sighted decision vis a vis his medication.
I would TOTALLY do Survivor, the only thing stopping me besides probably not being interesting enough to cast is not being able to leave my job for three months.