Yes, we have seen some fine examples of its destructive force right here at FR over the years.
There is very little evidence of true and broad-based groupthink here at FR. The constant and many flamewars that change no one's thinking put the lie to any such suggestion. For example, I cannot think of a single post I have read by you that I believe has any merit, intellectual or moral, at all. I am sure if you have read my posts you have reached the same conclusion about me.
I don't understand your claim to be conservative. I firmly reject it.