Question

casteism and communalism are bad what makes feminism a good thing

Answer 1

Casteism is the principle in which one caste is superior to other. communalism is the principle in which one belief is superior to other.

Feminism is the movement/principle which focuses on the idea that both genders are equal.

So, Basically communalism and casteism are concepts to promote inequality whereas feminism promotes equality.

Note : The question is flawed as communalism and casteism can be compared to sexism but not with feminism.