The woman who shot the cat is a veterinarian. She could not tell that it was not feral (if indeed it was not). The cat did not have a collar. Feral cats should be destroyed—they present harm to local fauna and risk of disease. If you don’t understand that, you are part of the problem.
The woman who killed the cat had to know that it was a pet and not feral, and she is now an unemployed veterinarian, and is now being investigated by the Sheriff’s department.
You shouldn’t be proud of your inability to identify a feral cat.