In reply to:

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Sure, it's still vandalism, and I see it, but it doesn't affect me in any way.

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Are you sure? Do you never get frustrated with the treacle-like pace of the overloaded links on the net that are trying to transport worm traffic as well as your valuable data? Never get mail bounced (or worse, dropped) for no good reason?

On the net, we all suffer from others' security weaknesses, like it or not. Like you, I've never been directly affected by malware, and take reasonable precautions to avoid it (choice of OS being an important start). But a surprising amount of infrastructure is vulnerable to attack (from denial-of-service upwards), and when it is attacked, conscientious netizens suffer degradation as well as the reckless ones.