> I personally don't have any murderous history to hide
I've been meaning to ask, could you please remove the curtains to your bedroom so I can see in? I know you're not doing anything wrong so you've got nothing to hide.
I think his point was that using this qualifier gives more credence to the "nothing to hide" folks. The more people get used to saying it in defense, the easier it becomes to use as an attack.
Sounds like a free speech issue.