Forcing people to desperately go about their day finding the least worst way to die. There is nothing worse than routine, like everyday life.
Force them to stay alive for their personal pleasure? I'm sure they take great pleasure in people being impeded in their CTB project. They have no empathy, they don't even realize the suffering it represents. I'm sure they think these people will change, find that life is wonderful because of them. They say to themselves that those who once had a depression are very happy not to be dead and that today they prevent others from CTB, to "do good". There's something narcissistic about it. To feel like the savior, the guy who is right, the guy who controls them. That these people owe him something in the end.