FYI "some opinions are just wrong" is a judgement, and it might make life easier to understand that what you consider "wrong" is your subjective _opinion_ :)

I totally don't mean that in a condescending way, just sharing my thoughts from my own experiences!

When you say that the El Paso shooter believed that the US is under invasion, that was his incorrect belief, not a "wrong opinion". The opinion would be that he thinks he's justified to try to kill those people.