You are assuming what you are mean to prove, namely that life is inherently valuable, and that marriage is not inherently valuable. Someone who favours euthanas

You are assuming what you are mean to prove, namely that life is inherently valuable, and that marriage is not inherently valuable. Someone who favours euthanasia could easily say that death is a positive resolution to disease. To those who say life has inherent value, death is not positive, no matter the pain it may relieve. To those who say marriage has inherent value, divorce is not positive, no matter the pain it may relieve. To turn your argument back on you: Death as a reaction to health/life turning sour is a positive outcome, since we've conditioned on that development and it's now a sunk cost. I happen to think that both life and marriage are inherently valuable and worth sacrificing for and holding on to, and for similar reasons.