The only observation I have is that one can learn a lot from adopting different personalities online. I don't disagree with anything that you said, but there is value in the data that is collected for example, by pretending to be younger, or older, or from different place or whatever else people may have special consideration towards. You can gain a lot of valuable insight about why people do things basically testing them against different scenarios.
Even in aggressiveness, as much as I may dislike it, there are a couple of lessons to be learned. If they pay attention they will probably learn the same lesson you did, that is not worth it, that violence is not productive.
Sometimes I takes making a mistake to learn, so I don't think people should refrain themselves from exploring different approaches to delivering their message.
Yes, I think it's unnatural to expect people to skip the experimentation stage. When people first see the possibilities, they are like "wow, what if I do this, or that", and they often do, and they often have a laugh, or get some kind of experience / lesson, etc etc.
Once one is saturated in such experience, they'll move on. They'll only retain this duality in special cases, one of which is the heated debates where they'll put the "angrier" face on.