This device really makes a lot of sense. Anyone that subjects themselves to this is probably so stupid, it's not a bad thing if they never recover their fertility. They don't have enough gray matter that they should be breeding anyway.
It's a pity they can't rig television sets to do this. You know, sterilize the dolts that watch shows like "Dancing with the Star" and "American Idol". It would cause some short term problems, but, in the long term, would be a real shot in the arm for evolution.