It's a difficult subject, I'm not sure there's a good answer. I agree with @Jute that it will always tend towards scope creep - a bit like VAR, but not as important.
It's the concept of playing God that I find the most intriguing. We've stripped the earth bare, dropped nuclear bombs, sprayed indiscriminate chemicals across the planet. The entire concept of civilisation is based on playing God (or the work of the gods, at least). On a daily basis, we decide that not only can we dictate the entire lives of the animals we eat, but we destroy any animal that might also want to eat them, or the food that they eat. Every single city, town and village is designed around the concept that humans are separate from (or higher than) nature and subject to none of its laws. We are, for all intents and purposes, within this system of ours, God. We can decide how every other animal dies, but when it comes to another human, it's playing God. That's a fucking bizarre God.
Euthanasia is a logical conclusion to our system. It's good for economic growth. Probably.