The thing is that this is a huge part of fighting. Without soccer kicks or knees to downed opponents it leaves huge gaps in how real fighting is vs prize fighting. I realize a lot of people are talking about "how dangerous" soccer kicks are, and they are dangerous and very effective. But I'd say no more dangerous than a high kick to a persons head.
In a real fight if one fighter is standing and the other guy is on the ground, the guy who is standing holds a tremendous advantage over the guy on the ground. But this is not true in most mma, in fact its often a "stalemate" position which is completely unrealistic of a natural fight.
I do see the reasons why soccer kicks and knees to a downed opponent are illegal, but I'd argue those are the same reasons head kicks should also be illegal.
If a law is unjust, a man is not only right to disobey it, he is obligated to do so. ~ Thomas Jefferson
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