CGP Grey 的这个视频完美的描述了品葱-_-

Same could be said for any forum, especially those within China that are carefully and delibrately filtered by CCP and its arms.
You didn't seem to realize that Grey's video describes a conundrum still yet to be resolved. One can only rely on individual and collective morality to refrain from extremism, and morality is only to restrain oneself.
Accusing this community of a filter bubble (not saying it does not exist, in fact, there is systematic fault to be discussed) would be unfair if you haven't learned how it's developed its collective stance. But congratulations, at least you are reading out of your own bubble. Hopefully some of us could get out of ours.

P.S. Some off-the-topic advice for you to take with a grain of salt. Although I like Grey myself, I have to say, he might not be the best source of knowledge for you. Grey used to be a physics teacher and is a technology enthusiastist. Than means he's understanding in sociology, psychology, and other subjects concerning human instead of matter will echo those in STEM. So, he and you share the same strand of "thought germs". If you truly wish to become more sophisticated in these kind of discussions, I'd recommend (you, and anyone, frankly,) reading old style books as opposed to contenting yourself with YouTube videos.

（因为题主给了小灰的视频和英文描述，但是没有给出中文，我预设楼主更愿意用英文讨论了。给英文不灵光的朋友们鞠躬致歉。）

I just hope that pin cong can be a place where we can rationally discuss instead of being another echo chamber

As most if not all of us hope.