That (birth control ) is being done in places here...people pay to have ferals rounded up, “fixed,” vaccinated, then returned to their home area where they keep the rodent population down
That is a very humane idea to “fix” the ferals. I hate to seeing starving animals of any kind. If this “expert”, cat-phobic doctor is so concerned, why don’t they work on safe wild bird houses or some other constructive idea, instead?