This is a pretty common phenomenon in politics, where people have a political view that is obvious to them, but other people actually disagree with that view. This is one way that political discussions go off the rails, because if you think your own views are obvious, you quickly start thinking that people have some ulterior motive for debating that "obvious" view. But the reality is often just that they just have a genuine difference of perspective, that the thing that is obvious to you is just not obvious to them.