Keep your cat inside.
Annual bird mortality rate from cats in the U.S.: 1.4 - 3.7 billion
Annual mammal mortality rate from cats in the U.S.: 6.9 -20.7 billion
Free ranging cats have caused or contributed to 14% of modern bird, mammal and REPTILE extinctions.
If you have a cat and let it outside then you are an irresponsible cat owner, period, and IMO should be allowed to keep them.