The thought of being restrained in any way is terror to me. I once had to coerce a surgeon into NOT tying my hands and feet, and that was the only way I was willing to have the procedure. I am also terrified of any kind of sedation or general anesthetics, and I wanted the surgery with only local anesthetic. The doctor finally agreed after I agreed to have an IV inserted & ready for sedation in case I suddenly changed my mind, and to have wrist and ankle straps positioned but not fastened. I cooperated perfectly and amazed him.. No need for anything to be buckled or administered. There was a little girl I read about at a local hospital who tore the ligaments off her own bones trying to get free from medical restraints. It's no laughing matter, and I pray that medical, fire & rescue, and law enforcement personnel are educated on this. I think it's very clearly an Asperger's/Autism trait, and it's not something that we can control in ourselves. There was also a case not long ago, where an Aspie killed a nurse accidentally with her bare hands, when the nurse was trying to apply restraints in the emergency room.
It's my guess, that this is probably an extension of the fairly common Aspie/Autism trait of not wanting unexpected touch, or invasion of personal space. If someone suddenly tries to hug me or pat me on the shoulder, they're most likely to get the elbow in the ribs as a first response, even if it's a close friend. It's not anything I can control easily, and I know that probably sounds goofy to NT people. Even if it's a friend or relative, and the hug/pat is totally expected, I still flinch and tens up, and cower back.
Charles