You FORGOT that it was illegal?
Get even more discouraged by talking to a few people under 30 about downloading photography - they probably have never realized that it's illegal. But when asked whether they would steal a pack of gum from a store, they reply, "of course not!"
What can you do? Make your New Year's resolutions to:
(1) Protect your photos through registration,
(2) educate through users/viewers copyright notices (check out Andrew Zuckerman's notice), and
(3) prosecute infringements - even if it's only a DMCA take-down notice or a cease and desist letter.
Here's hoping for a better 2009!