I think it's the simple fact that some people are assholes and some aren't. If you're a bully as a kid, you get suspended or have to write sentences. If you're a bully an adult you get fired or go to jail. Bullies are born that way and are usually always that way, they're just allowed to get away with it as kids. Some cases may have to do with self esteem but I don't think it's a majority and definitely not a defining factor.
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