The "gun analogy" is the parent saying the the government (who is supposed to be the only entity able to use force) is supposed to protect IP. You're saying the same thing.

You shouldn't say anything to anyone who doesn't respect copyright laws - or, rather, you shouldn't have to. Your tax dollars, and the entity that you authorize to be the one to use force where you live, should be able to say whatever you, as the governed citizen, want to say to the person who doesn't respect copyright.