"Some rapists don't even serve this much time."
Gee, you mean that some criminals don't serve the maximum possible jail time for their crimes? Unless this law is the one exception in all of US law, movie pirates won't all be serving the maximum time either, so they can still expect to serve less time than rapists and murderers. Since you'll probably get just a few months, go ahead and steal as many movies as you want!
After all, it's all in the name of "privacy" - which obviously no-one except criminals have a right to. By the so-called "logic" of most slashdotters, anyone involved in the movie industry certainly can expect no right to privacy - unless it's to protect their cocaine.