I may be the only one feeling this way, although that would be odd... People who troll on the internet are also assholes in real life, at least most of the time. The troll-scare these days seem to suggest that people are more civilized out in the physical world. Are they? Really? I'm not so sure.. Take teens, as an example; When I grew up back in the 80s and 90s, bullies and assholes were not uncommon. Out of a class of 30, at least 3 of the boys were complete asshats, and that seems to be a way higher percentage than what we see on the internet. If we expect civilized behaviour equal to what we see in our everyday lives (by that I mean the fictitious asshole-free reality people seem to live in) we will either need to ban everyone below the age of 24'ish (most the people under 24 are just fine, but the vast majority of trolls are in that age group as well, you kinda lose the need for attention as you grow up) or we need to accept that playing with kids means someone will call you by your childhood name, "Fucking Nerd Fuckhead!"
The most important thing regarding trolls is to just ignore them. As has been said forever: Don't feed the trolls.
The responsibility lies on non-trolls to class up the interwebs. We can never change other people. Least of all assholes.