I can walk up to you in real life and say whatever I want too; you dont know my name and won't unless I or somebody else tells you it. It has nothing to do with being on a computer, it has to do with what information I choose to disclose.
What you pretty much said is that you want to force people to disclose more information about themselves so that you or other internet vigilantes can use their name and whatever else you can get your hands on so they face "retribution" for saying something you don't like. Do you not see why thats ridiculous? People calling a person's employer to get them fired because he said something they felt was racist, messaging the persons friends to try have them sever ties over what a person said on MMO Champion?
I could scream racial slurs at you for an hour in real life and nothing would happen; you wouldnt be able to find my employer or message my friends. I make a post online and suddenly you use all my personal information to get back at me, somebody you dont know, for what I think?
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The benefit is the ability to attack people's real life--people you have never met--for something they say online.