Noooo! (A new opinion)
Well, think of it this way. If you just had your other arm and both legs chopped up, you're just a torso and a head. That might hurt. And be quite depressing. Maybe Vader was just expressing his angst for being in such a crappy suit, and the pain he was experiencing? Honestly, what would you say? God damn? C'mon, this is Star Wars. We don't swear.