Why, exactly?
Many people would say that consenting to be a sub or a slave would clearly show that you are not in your right mind. But we here know that it is usually an informed decision from people who know what they are doing, and who consider themselves free enough to give themselves away if they so choose.
So where does this ability to decide you own fate stop? With you apparently at death, and I also feel that the idea of killing people is extremely abhorrent.
But to me that is beside the point. The point, to me, is that a person has a right to decide their own fate. That includes suicide - who can know for another person when life is too much, or sickness or pain is too much? We live inside our own sculls, and that, to me, means that only the person themselves can decide for themselves, but also that only the persons themselves have a right to.
To me, life is only worth living in freedom, and for other people to try to take control of my life in any way what so ever is wrong, and why to them it may be a matter of compassion, to me it is a matter of the ultimate disrespect for another person.