Besides all the decapitation and manipulation of opponents' body parts in terms of fatalities, parents, while playing the game just to test it, you have to do the the deadly, self-killing finishing moves, called hara-kiris! Those types of move sets, which go beyond the ancient Japanese self-killing move of slicing open the abdomen (e. g. Noob Smoke self-destructing), as the name suggests, really convey the wrong message to your children - they're convincing them that if they lose a game, chances are, they will commit suicide! What parent would think of that - suicide in a fighting game?
Violence, gore, blood, and suicidal messages aside, think forty times before buying it for your children!