I don't get the limitations thing. My math may be shakey, but take speed in mps, weight in grams, Chevy's big Suburban and a Hayabusa:
Busa 510 lbs (231336 grams) at 200 mph (89.405 mps) for 1,849,127.413 Kj
Suburban 6600 lbs (2993760 grams) at 60 mph (26.821 mps) for 2,153,716.341 Kj
So, even at freeway speeds, a Suburban packs more punch then a 200mph Busa. Given a 200 mph bike in traffic is more likely to cause an accident, but when one occurrs, a giant SUV is going to cause alot more damage and potentially harm alot more people.
My numbers right on this?