You act like all of that is completely unplanned. You do understand that "professional" wrestling is all staged, right?
Yes. And this means it’s easier how, exactly?

The wrestler already knows that he's going to be thrown, and therefore is trained to land safely
It must feel like landing on a bed of pillows then.

Haven't you noticed a lack of serious injury?
People get injuired quite often. No deaths thankfully but accidents are not exactly infrequent.

Seriously, if someone was thrown from a 20 foot ladder and landed the wrong way, there could easily be broken bones or even worse.
That’s pretty much the idea.