There are two types of riders:
1) Idiots who are willing to accept risk in exchange for performance.
2) People who prefer safety and comfort and are willing to wait their line in traffic.
The first type of people want bikes because they are the fastest machine you can get for the money. These people will love their bikes for all of the several weeks of their remaining lives. There is no way for these people to ever be safe riders, no matter how skilled. As their skill increases, so do the risks they are willing to take.
The second type of people could be good, safe riders, but never will be because they don't see the point in motorcycles. There is an exception within this group, of course: the fashionista Harley riders. They have no interest in performance (if they did, they'd be on a real bike), so they are likely to be perfectly safe. Their enjoyment from the ride has nothing to do with speed or performance, so they can rumble along perfectly contentedly and don't need to take risks or push limits to enjoy themselves.
If anyone cares, I'm the first type. Virtually everyone who has ever bought a bike is. Also just like virtually everyone who has ever bought a bike, I hope to own a ridiculous car someday. Maybe an S2000 or an Elise.