The sick person is the person who feeds cats and takes no responsibility for them. That is the person who causes dead cats on the roadside, as sure as if he ran over them himself.
I work for buildings and grounds in a large former military site, now occupied by various government agencies and government contractors. When I started here, we had about twenty people feeding cats and about 200 cats on site. We had diseased and dying cats all over the place. We would have a dead cat on the road out front pretty much every day of the week. But we had not a songbird, chipmunk or squirrel for as far as the eye could see.
The first thing I did was run an education campaign to explain the facts of life to our ever-so-compassionate cat feeding folk. A few weeks later I boarded up every location where cat feeding was going on, and got management on board from each group to eliminate the feeding thru threats of personnel action. Finally I got a animal control contractor to trap and euthanize the remaining animals. We were down to about 60 cats by then, 50 of which were trapped. We made the trapped animals available to the people who had been feeding for all those years, and only one cat was taken home.
I was not a popular guy when all this was going on, but it had to be done. Now, several years later, I have no cats whatsoever. They are simply not a part of the wildlife mix if nobody feeds them. But I do have songbirds, raptors, wild turkeys, fox, chipmunks, squirrels and just about every other critter under the Sun. It was a choice between dying and diseased cats and a healthy mix of diverse wildlife. Which one would you choose? Which choice is cruel and sick?
As for that one cat taken home? I still have him today.