The answer I came to as a kid is that bullies don’t see themselves as bullies, and so they root for the heroes in stories and root against the bullies.
I used to think the same about the kinds of adults that vote for Gilead-type policies and politicians: that they don’t believe they’re doing this (even though they are) and so they root against Gilead and the other “bad guys” in media. But I’m no longer so sure about this.