It's really not about "deserving" anything. Neurons can only take so much. They are only equipped to handle so much stimulation. Whether it's good or bad (hence why euphoria can be just as damaging), overloading the circuits wears them out. It becomes harder and harder to recover. The worst part is if you are still stuck in a life where the stimulus causing the problem just isn't going away. It's possible, but it's incredibly hard. It requires some gradual reprogramming. Cognitive therapy and, if necessary, chemical therapy will do what it can to assist. It's a slow process, but people must hold out hope. After all, it took years to get the brain to act that way, so it won't heal overnight. At any rate, it's mainly about cutting the neurons some slack so they can recuperate from the storm of neurotransmitters.