Consent - something which the monkeys have not given. Something which their world-splitting cries of agony, anguish, and tortured existence, clearly indicate. It appears their disposition to being used as biological pin cushions is quite oppositional, one could say their entire life is dedicated to saying "No."
Imagine a life dedicated to saying "No." Your mind is disoriented, deteriorating. The world is spinning, and your insides are churning, throbbing, and burning with the pain of a thousand suns. Your skin is peeling, your muscles ache, your bones dull with a hollow pain, and your body feels like it isn't even yours. Implants and incisions, scars and scabs, your body riddled with pockmarks.
It sounds laborious and awful, more than nightmarish.
Would you volunteer for it?