The internet has been around a lot longer than blockchain.
The issue you're talking about relates to the internet in general.
We're very familiar with the problem. Blockchain is new.
You don’t think that same thing will carry over onto the Blockchain?
Of course it will, and does. You don't think that this technology will have any effect on such behavior, nor that it will incentivize different, unforeseen behaviors?
When people are able to be anonymous they are more likely to say things and act in ways that are unlike the way they would if they were face to face with someone.