I love Danny McAskill, he was on The One Show last week doing somersaults on an exercise ball (on his bike of course). He is truly amazing.
My son lived and worked in Taiwan and he came home with some fairly hair-raising stories about multi-passenger trips on scooters.
Re the OP I don't think "these people" should get 500 years of jail, we used to do stuff like that all the time as kids, my brother would lift me to work sitting "side saddle" on the crossbar of his bicycle all the time.
The thing that intrigues and interests me, is what is going on with people like McAskill - is it a new evolutionary plane for motor skills or what? Some of the bike tricks are positively balletic.