What a double edged sword this Internet technology has created. On one side, a choice of anonymity feels almost like a right. On the other side, the abuse of what anonymity is there by criminal and even terrorist elements is a great threat to human society.
Wish I had an answer to propose, but I don't. I'm just happy to see a discussion trying to probe the topic.
This isn't the only double edged sword that modern technology has generated - how about IP (intellectual property) issues. On the one hand, the existing IP laws feel "right and just". On the other hand, it's also clear that the historical laws just don't work well online. It's something like what sampling technology through at musicians and composers, only much more widespread.
And IP issues are nowhere near as knotty as anonymity issues. We've all got a big job to work out here if the future is to be benign and truly human.