Guns fill a role in society that allows any person, no matter how weak, to execute deadly force against another. For many, this is the height of idiocy. Why would we allow individuals to have such power?
But technology is doing the same thing that guns do -- it's giving every person unprecedented power over his fellow man. DDOS attacks can bring down banks. Bio-research could unleash a deadly plague. As technology increases, the powers that one person has continue to grow.
So the issue of gun ownership is the same issue as freedom in technology. How much power should one person have? Every time somebody commits a crime on the internet, we're going to hear the same cries: why should individuals have so much power over others?
I don't have a facile or slogan-worthy answer. As a libertarian, I always want to err on the side of empowering individuals. But I can see a powerful argument to continue to take freedoms away from all of us. The issue of gun control was just the first shot fired in the larger war that is now upon us.