It's the Christian thing to do

OMG, yet another example of the demonization of an 'other'.

How can anyone claim that any sect is the only, perfect sect?  This just says to me that it is all manmade.

Mercy killings are to relieve incurable suffering, and not every animal without a loving family needs such relief.

There you go again, presuming way too much. It appears that you think you know people better than they know themselves. At any rate, I've already presented my argument. Let me know when you want to address it instead of dismissing it by regurgitating the same debunked talking points.

I know this portion of the thread is about abortion, but...

I have a relevant story about the pet euthanasia debate, which is the point being made by your bolded type.

I worked for a shelter, after sitting on its board for more than ten years, and while I was employed, the full-kill/no-kill debate became an issue.  Many on the board were for being a low-kill or no-kill facility, but one board member, a retired veterinarian from Germany who had been held by the Russians after capture during WWII, had a different opinion. 

He thought it was inhumane and cruel to keep a dog kenneled in a cage for months on end, when its likelihood of being adopted was near zero, due to behavior issues or health issues.  He, himself, had been kept in a cage and treated inhumanely by his Russian captors, and he said that he would rather be dead than kept in a cage.  Even though he was finally released and came to the USA, that time of imprisonment weighed heavily on his psyche, some five decades later.

Very few 'special needs' dogs are ever adopted, unless the rescue group has the funding to maintain a humane environment for those special needs dogs, and funding is hard to come by.  As much as I love animals, I would rather see a dog humanely put down than suffer confinement, neglect, or possible violence if it is adopted by someone to put into the fight ring.  I have seen animals that have been hoarded, caged too long, torn up by other dogs, and the only humane answer is euthanasia. There aren't enough homes for them all.

I wish humans had the option of doctor-assisted suicide if they are terminally ill and suffering.  Each individual should have the right to make a judgement on the quality of the life they have remaining, especially if in uncontrollable pain.  There is a difference between living and being forced to live in pain.

Quality of life has to be an issue in the debate, in animal sheltering and in the case of a fetus being unwanted by the mother.  Ideally, all birth control would work, no woman would be impregnated without her consent, and all babies would be wanted and lovingly cared for.  But that isn't reality.  Any more than the notion that there are enough homes for all unwanted pets. Ideally, more pet owners would spay and neuter to prevent unwanted litters, but ask any shelter employee how likely that is to happen.