FunkDoc1112
Heavily Armed
They actually got the chance to do that stuff due to circumstances. Raditz died. There was never any use in bringing him back like there was in say, Frieza since he didn't hold a candle to anybody else. I'd imagine his whole existence is a fart in the wind to Goku, and him being his brother doesn't add any extra sentiment since Goku grew up without him and only knew him for literally a couple hours.Vegeta tried to kill Goku and Gohan with every dirty trick in the book.
Frieza tried to kill Goku and Gohan with every dirty trick in the book.
Buu literally killed Goku's entire family, and then he wished him back to life.
And all these people became his allies.