This is most ever battle shonen. Majin Buu in DBZ destroyed countless planets and wiped out billions and everyone just chills with him because he's giant baby made of magic bubblegum.
Well, Majin Boo did get rid of all his evilness before that, separating from his bad counterpart. It was basically the same Picollo did and then his good part proceeded to become God of the earth, so.
Not really. He pretty much gained everyone's trust during Namek except for the people who were dead then and those people got over it when he became a Super Saiyan.
Uh, that wasn't like that at all. The only one stupid enough to trust him completely from the start was Goku, and the only reason for that is that he is as much a sociopath as Vegeta, being a pure Saiyan.
Gohan and Kuririn were terrified of Vegeta all the time they were in Namek, Kuririn said several times they didn't trust him and were cooperating because they had no choice, and when they managed to gather the dragon balls they actually tried to fool him, but it didn't work.
Back at the earth no one still liked him, again, except for Goku, and now Bulma, who is kind of a nuthead. It is clear that all through Cell's arc no one likes the idea of having him around, specially not Yamcha, Tien and Kuririn.
People only got comfortable around him in Boo's arc, 7 years later, because at that point he wasn't a threat anymore, since Gohan was stronger than him, and he had an earthling family by then. Also his ambitions changed from getting his revenge and become immortal or whatever to simply beating Goku.
