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NEWS: Dragon Ball Bonus Story to Run in Viz's Shonen Jump on Monday

That being said it s quite odd that Goku mom actually has a gentle nature considering that she was raise in a society that values fighting and destroying other life, as well as being a saiyan she would have this natural love for fighting like it was mention the story (although that didn't stop Goku for being a gentle, caring character in the series so that later part may not apply that much).

That's an awful explanation. Vegeta changed because when exposed to the Earth culture and through the various trials he endured he finally learned to appreciate other people besides himself.

Bardock and Goku's mother were born, raised, and when not on missions, lived on Planet Vegeta with its warrior culture, obsessed with combat. There's no reason not to believe that they were any different from Raditz, a brutal, murderous sociopath who died before learning what Vegeta did. Well, no reason not to believe that until now, apparently.

Goku, and the readers, were told by Kamesennin, that Goku's "grandpa" Gohan found his space capsule, and took him home, but he was a violent little turd until he fell into a ravine and bumped his head, after which he behaved himself. So we can only conclude that, yes, Goku gets his personality from irreversible brain damage. If he hadn't bumped his head, he would have been just as brutal and destructive as any ordinary Saiyan.