The second video is a famous one from my home country, Hungary. It happened in the mountains close to where I used to live as a kid. The guy on the OTHER bike died instantly, this asshole survived, but was in a coma for a while, then got a couple years in prison. The usual story: put a powerful bike under a troglodyte and watch what happens.
That first video. i dont want to comment much other than that guy is a make the beast with two backsing moron who should learn how to ride a bike first. The 2nd video is just... well after what hunduc said i dont even know what kind of words id wanna say. its just a mess of frustration and anger on the part of the deceased family.