I suspect there are a few factors: * Motorcycles aren't very dangerous to bystanders. * Approximately zero infants or toddlers are routinely transported via m

I suspect there are a few factors: * Motorcycles aren't very dangerous to bystanders. * Approximately zero infants or toddlers are routinely transported via motorcycle. * Motorcycles don't make up a large percentage of traffic in the U.S. * Motorcycle deaths are more likely to leave donable organs intact, so it's a bit like the lottery, but for organs. Some people opt in to entertainment, and the rest of society benefits.