skateboard crash- when will they learn?

Stuff like this shows up in videos all the time. It must happen to pretty much everyone who even tries it.
I get the feeling that many of these videos look worse than they really are.
Or skaters don't learn from their mistakes.

Skater Crash - That Had to Hurt

Stuff like this looks fun at first, then the reality of it all hits you in the crotch.

Skater Crash - Nuts go bye bye!

Why wouldn't you bail when you realized that things weren't going well.
All he would have had to do is sit down.