“Then a smarter group of researchers had another idea. If you were stuck in a cage with nothing but food, water, and drugs, you’d probably pull that lever until you died too. Most of us would. I’d absolutely go full Scarface if the alternative was rolling around a cage suckling water hoping for salvation.” - That is, animals will behave poorly if they have desperate conditions. They will give up if trapped in a cage and given the chance of bliss.
Original source: Rats, Levers, and Parks: Designing Better Choices