Yeah, this is ultimately why utopias are impossible. It's not that we can't come up with a fair system that would distribute resources fairly and not abuse any group for labour or anything else. It's that no matter what system we come up with, there will always be power hungry fucks looking to abuse that system for their own gain and corrupt fucks that will take advantage of what powers or privileges that system grants them and use it to abuse and dominate others.

It's why we both need police and militaries in some form and why they so often turn into something just as bad or worse than what they were intended to prevent.

Bullying is just the same thing at an individual or small group level.