If everyone uses "It doesn't harm me, so I don't care" logic except those who are affected, it turns into a slippery slope, and soon no one will have any rights left at all. A much better criterion to use is whether the amount of power being exercised is reasonable for the benefits its use will bring about, and in this case the benefits are miniscule compared to the amount of privacy we would have to give up if this were enacted. I'd rather some people *not* know about my porn downloads kthxdie.
Eh I dont understand your logic either. People have so many rights. I would be willing to give up my right to let crime investorgators look into solving crimes. Why would I be against it, if I am not doing anything wrong?

And what is it you have to hide about your porn downloads?

Child protection advocates say that this process can lead police to dead ends if they don't move quickly enough and log files are discarded automatically. Also, many Internet service providers don't record information about instant-messaging conversations or Web sites visited--data that would prove vital to an investigation.