Yes, my Mamiya RB67 Pro S is strong and idiot proof. The only thing that I could see an inexperienced student doing would be to have mirror lock up on and shoot without a cable release...what happens is that the shutter will not fire until a cable release is inserted in the mirror lock up port and pressed.
Although I never tried it, I think that if you shoot with mirror lock up and no cable release, you can twist the mirror lock up knob in the off position and you can reset everything.
Plus you can buy RB67 kits for very cheap. Remember that the original RB67 (non Pro S and Pro SD) has much less safety interlocks, and thus is less idiot proof.