Any statistics about how much the population of stray cats and dogs has decreased since emphasis on spaying and neutering became so common?

I don't believe there's a national statistic list available yet. However, you could call your local animal shelters, both "kill" and "no-kill" to see if there is a local decrease in the numbers of animals being turned in or picked up as strays. In my area, since SNAP (Spay and Neuter Assistance Program) started coming with their mobile Vet van and providing low cost spay and neuters, and local Vet clinics provide "discount months," I have noticed far fewer strays.

With more TV ads focusing on responsible pet ownership and no adoption agency letting intact pets go, and more cities like mine charging for license tags for intact animals while spayed or neutered pets get them for free, there is growing incentive to get it done. Of course, I would just LOVE to see homeonwer's insurance companies give discounts to dog/cat owners (especially "bully breed" dogs) who provide proof of spay or neuter. This lessens the chance of a claim from an injured guest.

Imagine how many dog bites would be eliminated with this incentive alone.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.