In the early eighties we lived in a condo with a bad cat problem, so I bought a trap, a supply of sardines, and set the trap on our enclosed patio.
That night, my beautiful wife (in her early 20s) came downstairs with a very revealing outfit on, and asked "do you like what you see??"
I said yes yes yes yes yes yes, and she said, if you ever want to see it again, you won't kill those cats.
So, I chose areas that seemed to have a shortage of cats, mostly the airport, and gave them some.