It's true that we can't assume that suffering is bad simply because we don't like it, but why would you assume it might be good? Someone pulling out your teeth with pliers might indeed be doing it for your own good, but he also might be doing it because he's a sadistic psycho and it gets his rocks off.
At the age of five, Skagra decided emphatically that God did not exist. This revelation tends to make most people in the universe who have it react in one of two ways - with relief or with despair. Only Skagra responded to it by thinking, 'Wait a second. That means there's a situation vacant.'