It is an unsustainable attitude. If strays and ferals are not controled, if they are fed and protected, you get a lot more strays and ferals.
Animal "shelters" kill tens of millions of unwanted dogs and cats every year. You appear to be saying those are tens of millions of murders.
Am I misinterpreting your words?
I guess the concept of neutering and spaying via a TNR program to control the feral population is lost on folks.
There’s also a substantial difference between some disturbed psychopath cruelly murdering a cat (or dog) with poison, which is a horrible way to die, versus an animal shelter euthanizing an animal in a painless manner. I had to have a terminally ill young rescue cat put to sleep a year and a half ago to prevent her from suffering.