I have had a few different horses come to me with little to no human interaction previously. They have also been my only kickers. I believe that it was do to them trying to run in fear of not trusting me(the human)enough. Horses point their heads in the direction they will head, they can't run backwards to well now can they?
I have had one aggressive kicker who did it because she thought she was boss. I have learned from experience that you find out why they are kicking/turning. Is it fear? Is it in aggressive manner? Is it because they can't run so their next instinct is to fight? Watch the whole horse before, during, and after that booty swings towards you.
A frightened, un trusting horse will not take its eyes off of you. They generally hold their head up to watch you better and their tail clamps down and tend to squat just a little bit.
A horse with kicking intended will tuck his head down ears pinned back and won't be nearly as tense the tail will probably be switching and their feet will be pointed towards you more than their head is pointing AWAY. When reading your horses body language its easy to get focused on whats nearest or must upsetting to us. If it is a trust issue I will just speak to the horse and hold still making no movements to help that horse relax to the point of allowing me to rub, love, and brush him. Outside of the situation I will strive to earn his trust possibly putting us in some learning situations walking over boards or even just leading more. Once the horse willingly follows me without a rope I know I have his trust.
If it is an attitude issue I will immediately catch the horse, if possible, and reset the scenario that caused the kicking signs-but with a halter and lead attached. When rear turns towards me I pull their head to face me or give a firm tug, not a rough jerk! If this does not help I will hold the rope firmly in my left hand facing their left side and the tail of the rope in my right hand. When that booty starts to come I swing the rope towards their left hip and apply pressure with my left hand so they turn in circles until I allow them to stop- keeping myself nearest their head. I don't like to "pop" horses with anything or for any reason.
Normally once they get the idea that "I move my booty I have to move my feet" they tend to be more willing to have their nose greeting you. Praise with every little step of progress when they move that hip away, praise! If they move it towards you just move it away and make it unpleasant for it to be there. Horses are very smart creatures they learn quickly when we make it easy to learn.
Just something I've learned from experience and thought it would go nicely with all these other wonderful ways
each situation is different but we can prepare ourselves by learning as much as we can and seeing what works for us.