I am not even going to touch the skill/no skill argument. Everyone with a brain knows if you are not skilled you will get killed in mma.
As far as soccer kicks go to a downed opponent they look great and are fun to watch but they are exponentially more dangerous than elbows. They are also more dangerous than kicks t the head standing up. The reason is the cervical portion of the spine is sent backwards vs. side to side. Far greater chance of a fracture that can lead to paralysis or death.
I agree with matt that you had to do something to put your opponent in that position or they made a mistake to get there but there are more than one way to finish the fight. Or there is more than one way to skin a cat as they say. (sorry git had to throw that in there)