There is no question that motorcycles are much more dangerous than cars. Motorcycles are only 3% of the registered vehicles in the country, but they account for a large chunk of serious and fatal accident injuries. Motorcycles are much more likely to be involved in fatal crashes. A higher percentage of motorcycle accidents are caused by drunk driving, too.
The NHTSA reports that 13 cars out of 100,000 are in fatal crashes, while 72 motorcycles out of 100,000 are involved in fatal accidents. Also, for every mile traveled, motorcyclists have a risk of a fatal crash that is 35 times higher than a car driver. In 2004, there were 37,000 people killed in car accidents and 4,000 killed in motorcycle accidents. But remember that motorcycles are only 3% of registered vehicles on the roads.
Distracted driving is the most common cause of car accidents, with the National Safety Council stating that 25% of car accidents involve cell phone use. The most common cause of motorcycle accidents is cars making a left hand turn without giving right of way. About 42% of all car accidents involving a motorcycle are due to a car turning left. Lane splitting is also a common cause of motorcycle accidents. This practice is not legal in all states; you should check the laws in yours.