>>88405458To be fair, from the small sample we have seen, the saiyans in general are actually pretty intelligent.
Goku has fucking brain damage yet once he actually uses his (remaining?) intelligence he's extremely quick to learn even if it's only specialized at learning combat.
Gohan is half human but noone can really say he isn't intelligent.
I can't really count Trunks in this since all of his human genetics come from a line of extremely smart people
Vegeta is like the inbred idiot of all saiyans which probably has to do with him being royalty.
Not sure on Nappa and Raditz. Raditz at the very least is willing to negotiate and plan ahead since instead of trying to challenge Gohan to a fight he decided he'd be great for training.
Nappa immediately thought the obvious about repopulating the saiyan race via hybrids only to be shot down by Vegeta.
Brolly apparently retains enough memories to recognize Goku from the day of his childbirth.
That alt universe with nonviolent saiyans has em capable of the logistics and management needed to police the entire universe without even being able to transform into Super Saiyans.