Ego tripping.
When men were men and dinos roamed the earth there was Usenet populated by knowledgeable guys having knowledgeable civilized discussions. It was naturally self selecting cuz you had to be an academic or work for a think tank to know about Usenet. Then came America On Line (AOL) and the appearance of the 1000 posts a week guy who got drunk on suddenly having this megaphone for his opinions. The knowledgeable people fled cuz they had better things to do and here we are.
You can still find thoughtful knowledgeable guys on Audiogon, if you dig. Just like you have to dig through the dreck to find the good gear.
* The systems part of Audiogon proves there are plenty of guys carefully putting together great systems.