Just crashed into a Lamborghini!

Of course you can compare them, you're saying that a city car will do the job for driving around London, as will a hybrid.
Though you still see people going around London in supercars and ridiculously expensive bikes that are over the top for driving/cycling around the city.
Supercars cause less casualties than non-supercars (proportionally speaking of course) so I don't see your point there.

No, you cannot compare them.

Why is an expensive bike wrong for riding around the city?

It doesn't produce more pollution and would in fact be more efficient hence requiring the rider to need as much food.

Bike vs. Car comparison is null and void.