also dont forget
the villains had no terrible past, they were never wronged. they just did it because they wanted to and that is more realistic than all the stuff they have today.
why was freiza evil? because he could
why were the androids evil? because they could
why was cell evil? because he could
why was super/kid buu evil? because he could
why was broly evil? because goku never shut the fuck up as a kid and let him sleep!
why is this more realistic? in real life, are bad people always wronged in some way? are they all a product of a terrible past? no