If not unclear then by far unrepresentative of the internet as a whole. People on the internet are way more likely to be garbage variety drive by haters that seem to cling to mildly controversial topics like it's their sole outlet for aggression.

The only reason that civility could be retained is when there's strong representational or economic incentives to do so.

If you're on Facebook? (Wouldn't know since I've been off their stuff for years), one irrationally bad comment could have a lasting stain on your future representation. People defriend/mute you, and though it may not mean anything to you, it's definitely a negative incentive for a lot of people who attribute much too much emphasis of a snap decision a peer did out of boredom/indifference.

Secondly, economics. If you're a person accumulating weath as a function of influencer/content creator in all its many forms, you're usually a "nice" or an ass-hole persona. If you're the nice person attracting an audience around optimism, showing up to dump drama on your people will start to polarize your communities. Think of the notable people on the internet and think of those that skirt the line. There probably aren't many you can point to that are equal parts positive/pot stir.