That's a good point - we have to be confronted with opinions we don't agree with such that we maintain our mental muscles for reasoning about why some ideas are

That's a good point - we have to be confronted with opinions we don't agree with such that we maintain our mental muscles for reasoning about why some ideas are wrong/bad. Otherwise if we're only fed a stream of things we agree with, that can be used to smuggle in bad/wrong ideas without our knowing it or having much ability to confront it. Not to mention that every once in a while you're confronted with some challenging ideas that compel a change in worldview in a positive way!