Why is resisting an unlawful arrest illegal?

It doesn’t make any sense. It makes it sound like the police are always right. It’s you’re getting arrested for not getting arrested. Some people say oh you’ll die but death is a natural part of life. The thing is cops can’t arrest you for no reason.

Think about people like Ryan Ferguson:

https://en.m.wikipedia.org/wiki/Ryan_W._Ferguson
Why is resisting an unlawful arrest illegal?
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