There are wrong opinions. An opinion is a belief, and a lot of beliefs are simply wrong.
I know that's not a nice thing to point out, but it's true. Your opinion-- your belief-- may be that "taxation" isn't theft and therefore isn't wrong. But it is, no matter what your opinion on the matter may be.
Your opinion might be that the Earth is a flat disk. But it isn't.
Your opinion might be that anyone who destroys their own copy of Holy Pole Quilt should be punished. That's a sick, superstitious opinion, and yes: that opinion is wrong.
You are "entitled" to your opinion. You can be as wrong as you want to be. However, no one is obligated to behave as though your opinion is valid when it's wrong. They don't have to respect a wrong opinion.
Facts don't care about your opinions. You should care if your opinions don't match the facts, but for too many people, that's hard, and it would invalidate their most dearly held opinions. So they won't do that.