" On what basis do you claim that enhancing life is right or that diminishing life is wrong? I suggest this comes from being surrounded by a pervasive Christian society."
Sorry, but I think if you look at most religions throughout time, or at most of the enduring social norms in societies, you'll see the impetus toward life and away from death.
In fact there is no higher purpose or calling than the creation and propagation of life. And not just in the human species.
Just look out your window.
Sorry, but I believe you are wrong when it comes to human society.
The impetus is toward protecting the self and the tribe (i.e., the immediately related group) and the other be damned.