If a rational person feels their own suffering is too great and wishes to end it, I have no right to deny them. If someone is capable of justifying war or the death penalty and is against RTD then they are hypocrites. If I were suffering and had tried every possible method to be cured, I would still hold on to every second no matter the pain and suffering because I know this live is the only chance we have and is the only time I will exist. However this does not mean my believe should be forced onto anyone else. If others believe they will go on in some afterlife and cannot bear the pain in this world, so be it, let them go.
I am in favour of Right To Die legislation. None of us gets a choice about the circumstances by which we enter life (where, when, to whom, etc) The choice about the circumstances under which we leave life is (or should be) our own - legislation would only acknowledge that. It is a matter of restoring balance.
If someone is terminal and in horrible pain no one should deny them the right to end their life. But, if the yearn to end a life is a result of depression then It can be modified by therapeutic drugs and should be tried before giving up.