When faced with either a quick release to an uncertain fate (Nobody knows-- with certainty-- what happens after death. I am agnostic, and as such wont say there is or is not any kind of afterlife) or a slow and prolonged wait before eventual, natural termination (old age-- EVERYONE dies eventually.), the nature of that slow, and prolonged wait should be what is considered, if one is to be a pragmatist.
Say for instance, the self-ascribed "unreformable pedophile". There are many different psych profiles for people who engage in pedophilia, and for some the drive to have intimate relations with underage children is every bit as powerful as other, more respected and accepted forms of sexual drive. EG, these people are no more "Reformable" than is a gay person, or a straight person. Not all pedophiles are of this type, but some are.
Our society has a hard nosed policy about sexually intimate relations with children: It is illegal, and will be punished. We do this because children are not mature enough to deal with a sexually intimate relationship, they are not physically developed enough to safely engage in one (it is often physically harmful for them) , and the consequences they endure by being involved in one leaves powerful, and long lasting scars on their psyches, and results in diminished ability to live in society as adults. For this reason, when we catch pedophiles of the above type, we either have to hold them for life, or execute them. Their rate of recidivism will be near 100%. Letting them go DOES mean more children will be hurt.
I use this example, because it was obliquely referred to by OwlBread earlier.
Hypothetical situation:
We have captured such a pedophile. This is not his first victim, and not his first time being caught. He outright says he will do it again if released. Psychotherapy has not been effective. He does not want to live the rest of his life in prison.
If you say that it is always 100% wrong to allow people to choose to die, whenever they want-- and that society has a moral obligation to always keep people alive, regardless of their wishes or their circumstances, then you are telling this man that he cant choose suicide as an alternative to being locked in a cell for the rest of his life.
He is not depressed. He is not mentally disabled. He is not suffering from a mood altering mental illness. He has an incurable/untreatable sexual paraphillia. There is no means to make him stop being a pedophile.
Do we offer this man the choice of an assisted, painless, and easy death, or do we instead force this man to endure whatever adversities await him inside the prison system as a permanent inmate, incarcerated for pedophilia, and assert from blind faith that this is simply the only conscionable choice of action?