Why do all those reasons not apply equally to cars and motorcycles?

In case you hadn't noticed a bicycle isn't a motor vehicle. And as I
pointed
out in a previous post (a point which was ignored), if you start having
to
license non motor vehicles where do you draw the line? Scooters?
Skateboards?
Roller skates? Anything with wheels? Perhaps wheelchairs will have to
have license plates too. Its as stupid idea. Which is why its never
been done.

Problem is like most things a few idiots spoil it for everyone else.
Having
registration just to stop a some maniacs (who wouldn't bother to
register anyway
just like lots of people don't register their cars) would just make
life difficult
for law abiding people and do nothing to prevent the problem it was
designed to solve.

B2003