Its a dangerous game really threatening to kick peoples heads in when you haven't seen them.
I've got a mate from London who works as a minder, in real life its quite likely he'd hospitalise me in seconds, we're both on the same forum (not a bike forum) and he laughs his head off when he gets threats. He's a big lad and it would take one hell of a clump to sit him down, I doubt any of the internet mongs are capable of it.
You've got to consider when you're threatening an unknown quantity that the bloke might be a psycho who will track you down and hurt you.
IIRC Stig had a fall out with a chap on here who then found out where he lived and drove to his house and demanded satisfaction. Stig shit a brick and had to phone old bill to save his skin.