That you have an opinion is trivial. We all have opinions.
What that opinion is, is also generally uninteresting in itself, because
Why you hold that opinion is what matters. Especially since we're in a discussion forum. The only thing that can really be discussed is the reasoning behind an opinion, not the opinion by itself.
I have to disagree with this.
A significant percent of the time, I come to discussions specifically to find out the "what". I want to find out what other peoples opinions are. I want to see what different ideas people have. To see what details people catch that I didn't. To see what different perspectives people have. The "what" is extremely important. And the idea that other peoples opinions are generally uninteresting is troublingly dismissive. Furthermore, judging opinions based only on the "why" that a poster gives as explanation is just layers of fallacies.
Now, a lot of the other things you said, I agree with. How things are expressed matters, and we don't have to be tolerant of bigotry and prejudice just because it's an opinion. But that's a big step away from everything else you said. If I were to make some assumptions, I think your meta-discussion here makes sense when talking about some of the 50+ page, long term (often circular) discussions that sometimes go on here. But those are a small percentage of the threads that take place on ENWorld.