Polycarp, while I understand somewhat where you are coming from, I think you are “raining on the parade” so to speak.
The basis of the ideal of free thought is essentially that
“Everyone is entitled to My opinion!” That is the whole point! Some opinions may consist of facts, but not all opinions are facts.
Critical thought contains a combination of experience, facts, open-mindedness and opinion. Without opinion, no person could express free thoughts. They would be constrained by doctrine, whether it be political, religious, scientific, or what have you.
IOW, If I cannot express a thought without having to consider a particular doctrine, that means I cannot express myself without artificial constraints. That is just plain wrong. And I may be “wrong”, but I am expressing free thought.
Now, (And getting to the point I think you are making) the whole point of expressing an opinion is that the person expressing said opinion believes s/he is right. You may vehemently disagree, and throw facts in said persons face, but it doesn’t matter, it’s their opinion. An opinion doesn’t have to be factual, or “right”, it’s just there.
And of course, you as another human with thoughts, have a right to tear it apart.
You happen to be a Christian, who believes in a Deity.
I happen to disagree. You can tell me God exists. That is your opinion, not backed up by facts. I don’t believe God exists, and I cannot back that up with facts. That doesn’t mean you are right or I am right, it means we have thoughts and opinions.
As far as the SDMB goes, of course people will strongly defend their opinions, right or wrong, especially in certain fora on these boards. Would you rather we all become intellectual sheep? Whose opinion should carry the most weight? (Well, besides Cecil)
Poly, I have followed your posts with awe, envy, and respect since the LBMB days, but I think your OP was a rather pointless way of saying “People are strong in their convictions”