I think the biggest litmus test for if somebody is a retard or not in regards to this franchise is whether or not they think Goku was made "good" by the headbonk as a baby and would be evil without it. You can't have a fucking nature > nurture theme in a story where Vegeta exists you fucking retards.
A non-headbonk Goku would probably just be less stupid, or he'd remember his parents if you go by Toyotaro.
This is why to this day the only good "Kakarot" was in DB Sai, and that's because Goku and Vegeta switched places and even there Goku just loved fighting and wasn't a sadistic retard like evil Goku in other stories.