HD - in some countries you do.
I don't complain when boarding a plane that they've gone through everyone I own and looked to see if I have a machete stuck up my ass or something.. because if it means theres a smaller chance someone crazy will be on my plane.. I'm happy.
I have no issue with ID cards, bar the price (£300 now? They must be kidding.) I have nothing to hide and they can track me all they want frankly.
If I was on a train where a bomb exploded, I think I'd be less concerned about my privacy and more concerned about my safety.