When people can remain anonymous, they have the greatest incentive to be horrible to their fellow man. On the flip side, they could also be the greatest human beings on the planet. No one will ever know the things they do. You can also learn more about the true character of an anonymous person through their acts and approach to anonymity. How someone acts when they can't get caught is when you see who they really are.
How do you think these people did? Did you think anonymity helped them in these situations, or just made them awful people?