It enables people who would rather be disconnected to disconnect themselves, and gives sociopaths the ability to do far more.
The internet doesn't create people without empathy, it reveals that deep down, a lot of humanity didn't have it to begin with. The way society is starting to structure itself, though, lets that shine through more clearly.
A lot? I doubt LulzSec is more than five people. For every pathological script-kiddie there are ten Free Software hackers. The Internet has revealed new ways for people to be destructive, but it has also revealed more ways that they can be constructive.
Compare:
I doubt society was ever much more virtuous than it is today, but we do hear about the problems more. There is the orthogonal and much more serious issue that many more people today feel unfulfilled in their lives than they did before, but I can't even begin to address that -- read Infinite Jest by David Foster Wallace if that interests or concerns you.