Yes, there's a slippery slope and potential for abuse, but that is true no matter what. Should we waste a lot of resources causing unnecessary pain for people who are going to die anyway?
Used to be that medicine couldn't do much. Now we can do a lot. But should we, always? For Christians, death is not necessarily always the worst outcome.
My perspective is shaped by the fact that my father was a veterinarian. He euthanized thousands of animals, and, in general, people usually waited too long rather than acting too soon. Another factor is my fear of outliving my mind, as relatives of mine have done. I greatly fear the notion of wasting the investments I have for my wife's benefit on nursing homes and things like that that harm her, and don't benefit me.
My grandmother was 83, had cancer, and was far gone in dementia. The doctor wanted to put in a feeding tube. My dad said No, and she died a few weeks later. Did it make any difference? She was going to die anyway, one way or another. So in some sense, it was God's will that she was going to die. How would it help anything to waste $50,000 to keep her heart going for a few more weeks? And she was too out of it to suffer.
If they are going to die anyway, sooner is not worse than later. If an overdose of pain medication means sooner, but less pain, so be it (IMO). We pray "lead us not into temptation" and Jesus said that if you were persecuted in one town, it was OK to run to a different town - it is not His will that we incur needless and pointless suffering.
My $.02 worth, and cheap at half the price.
Regards,
Shodan