Why is that so ? ... I think that it must be because of FEAR ... fear that their selfish and thus fragile ego might be challenged.
I should know better by now just who it is that so commonly does that and just never even begin to read their posts. It really irks me when I do not pay attention to who those folks are and invest a lot of time reading through the comment thread formulating in mind what I will respond with, only finding out at the end of often a very long thread that I cannot comment because I am "not a friend" ...
As it turns out, when that happens, it has always been a person of the "Right-wing" and often "Christian" persuasion ... and those being the last choice of who I would ever seek "friendship" with under such circumstances anyway.
(I might not ordinarily post these thoughts but Gather seems to have little choice of subjects lately to respond to so what the heck) :-)