Personally, I think that a man should be given the right to peacefully die to relieve pain and suffering, but it should be heavily regulated, and this decision should be only given to people who are terminally ill or very seriously injured.
Another dilemma would be giving the right to let someone die to family members in case the man is not able to do this decision (he is in coma, he is not sane, etc).
On the other hand, intensive therapy can ease the pain and the suffering and who knows, the terminal illness the person is suffering from could be cured the very next day. Also, legalizing euthanasia can lead to a slippery slope effect (learn more about it here).
So, what do you think?