severus+remus
I am doing it more or less for the same reason that I did it at Hogwarts. A werewolf on the potion who is a decent human being during the rest of the month is almost certainly no danger to the population at large. Wards can fail, and safeguards circumvented. There are no guarantees, but a successfully brewed potion increases the likelihood that it will be a safe moon
I do it for the population. I do it for the people who would not care to bite someone and doom then to that life.
It cannot decrease the pain of the transformation but it can at least minimize the pain of mistakes made during the moon to zero - so long as it is responsibly taken.