A few years ago someone in the UK put an electric net over their vegetable patch, probably to stop cats. Long story short a cat was killed by said electric net. He was prosecuted but only got a fine of £60 or something. I suspect he might have felt that was good value to eliminate the cat shit from his veggies.
We used to have a bantam chicken and we'd regularly see the neighbor's cat sprinting through our garden being chased around by a small, bite-size chicken.
The cat would regularly terrorize the larger chickens, but it knew not to fuck with the little guy.
Instead you can face a year in jail if you put down the cat that's been hunting your rabbits and chickens