The Facts of Life:
I honestly don't think that this has so much to do with motorcycles, as it does with allowing idiots to breed and, in that way, impeding the process of natural selection. While a motorcycle may be used in a crime, it certainly cannot be considered a factor of causation. If a man pulled into a parking lot, jumped out of a Lincoln, then proceeded to beat the Hell out of someone; how many people do you honestly think would equate the act with what kind of car the culprit was driving?
Sorry folks; bloody minded psychopaths have every right to live, breath, work, breed, get a license and drive whatever they want. Also, if they happen to intentionally maim someone, and can afford the services of a good lawyer, they can probably get off lighter than they deserve.
Im not trying to make any sort of value judgment; Im just stating the facts. Money talks, criminals walk, and reporters will blame whatever it is that will sell the most papers.