If you want Win32 XP-Pro, you should buy it for 200$. If your son wants 20$ worth of music, he should buy that to. But in that universe, and in that universe only; you have a right to complain about filthy internet-worms with porn embedded.
In this one, you should have kept your mouth shut, and dealth with the problem by your own account.

If I steal a car, and the tire is flat, I don't go to round advertising it. I shut up and move on.

btw: If somebody "uploads" a file (from your point of view): It's allready been downloaded by you (or your sanctamonious son).