That first video only illustrates what happens when a freight train collides with a Kia. Not to mention that neither one of them showed any real skill in fighting to be honest. It was just mess. And if that karate guy was a black belt....then I'm Jackie Chan.
The second video wasn't really proof of anything. There was no real contact. Throwing high volume punches that do no damage only makes one guy tired and one guy annoyed. Oh...and it breaks furniture.
"I don't know if anyone is known with the art of "sitting on your couch" here, but in my eyes it is also to be a martial art.
It is the art of avoiding dangerous situations. It helps you to avoid a dangerous situation by not actually being there. So lets say there is a dangerous situation going on somewhere other than your couch. You are safely seated on your couch so you have in a nutshell "difused" the situation."