It wasn't banned because it was a conspiracy theory. It was banned because its members practiced hate speech, harassment, and bullying.
You should read the article.
You should read the article.
Just because some members of a particular religious or social group do bad things, doesn't mean you should ban all members of that group. If it did, all of Facebook would have to shut down.
And while that might not be a bad thing - it's not the point in question here.
P.S. I fully agree with the removal.