Pretty common sense finding. I generally use a phrase "religious stupidity and hatred" in the Bangladeshi context. We can certainly extrapolate that to "all kinds of hatred by ordinary people are due to stupidity." Note that I said "ordinary people." People who exploit the stupidity and hatred in ordinary people are generally not stupid. They are corrupt and do gain personally by exploiting the stupidity of ordinary people.
From a Bangladeshi context, when I see too much of religious stupidity in a Ph.D. degree holder, it bothers me too much. Because, that example generally propagates hatred (due to stupidity) among many other ordinary people. And the vicious cycle of hatred, exploitation of hatred, and sufferings for innocent humanity continues.
Sukhamaya Bain
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