Can't this happen with aikido too?
Sure, I believe it CAN happen in Aikido. But I think one would have to restructure the training a bit. Aikido doesn't come from a tradition in which I think this was done so you'd have to get a bit creative about how you train. Systema, on the other hand, is structured specifically to do this. They consider their system to be a mental and physical health system (martial abilities being a byproduct of proper training). They can get you exhausted and crying like a baby, feeling like every button you had was pushed and do it without damage to your body and without the damage to the psyche that comes with being abused.