My dad isn't around either, and it isn't for a good reason like "I died saving the Earth" but if it was I would actually be proud to have him as a father because that's an actual good reason to be gone for 8+years in total, and to be obsessed with battle.
He's the hero, he's literally popped up in front of Gohan twice when he was a little boy and beat the shit out of the people causing him harm.
As a son, that would just solidify the fact that my father is great.
Imagine seeing all your friends die, your mentor, and they're coming for you next and then your dad jumps down from a cloud and beats the shit out of the man who did it all.
Flash forward to namek for a repeat.