Where are you getting the stats about which states have better chances of finding a home? Are you also aware that there are dog rescues networks that work together throughout the country? A dog of that age and breed would have been perfectly adoptable. There would have been a great chance, anyway. But, the dog didn't get that opportunity.
As for the humane way to put a dog down, you are incorrect that is dragged off and held down. A responsible person: 1. Doesn't do it unless it is completely necessary and all other options have been exhausted. 2. There are people who come to the home, for a nominal fee, the owner (Who hasn't proclaimed "Hate" for the dog) feeds it bacon, chocolate and comforts the dog while a pain shot is administered. After it sets in, the euthanize shot is given. This is also done at shelters, when the owners remain involved and care.
The adaptability of dogs, you do not appear to know anything about. Dismissing people who do not agree with of falling for MSM's spin of the day, does not lead to good debate. It is as effective as Hillary declaring Trump voters deplorables in an effort to deflect.
