Why do you make unsubscribing from your mail lists so hard?

Oh, I know....Your marketing people want to say We have 2 million subscribers...Welll a cheer part of them are prisoners. And chances are: they hate your brand more and more every time they try to leave your newsletter and can't.
Have interesting info people are looking forward to read and they'll willingly subscribe to your newsletter. And please, if they change their heart and decide to become out of space explorers... let them unsubscribe!