Statistically and realistically are two different things. Statistics for all three (horses, bicycles, and motorcycles) are taking into consideration things like alcohol use, competetion, etc. But realistically, if you are reasonably trained, don't drink and ride, do not participate in competetive events, (or pretend you are on public roads) and learn to manage the real risks you take, you are a lot less likely to be injured or killed. The drunk, careless, idiots are the ones that skew the statistics. But this is also true for cars.
Az