My answer is "No!" though through life in at least three circumstances I have found myself in such pain that I wished someone would kill me to end the pain. I am glad that no one could, would, or did.
I believe in the Declaration of Independence, and that God the Creator has given every individual the unalienable right to life, liberty, and the pursuit of happiness. He or she, the agnostic or atheist liberal, who seeks the power to take that right from me is risking their own right to life, liberty, and/or the pursuit of happiness.
Consider the Merciful God, whose grace is often couched in terms of yet more pain, rather than terminating it. When does He think that killing is ever a mercy rather than a curse?
I also believe in the Constitution, in the right to publicly air one's opinion, though contrary.
Have I made myself clear?