Fetal cats play the role of invasive predator species in every ecosystem they have ever plagued. Australia is just the first to try to do something about it as the loses of native species mounts due to cats. Continental sized Islands, or continents its the same niche. Some ecosystems still have native feline predators, but their populations are dwarfed, and even outcompetrd by feral cats. Where feral cats wreak the most havoc is where most other felines are absent.

It wouldn't be that tough. Contractors airway exist in every state that their daily job is dispatching nucense wildlife. Government agencies as well, USDA wildlife services. Moot point there. Again using emotional language.

Laws already regulate humans' pollution and destruction of the ecosystem, and need to increase and be stronger. The same should go to controlling feral cats which get a 100% free pass to cause harm due to that human bias.

Anthropmorphizing animals gives them human-like qualities. Dogs and cats top the list. You are biased towards cats over the wildlife losses you don't bat an eye at.

Both methods are not well backed by studies but TNR is not well supported in reducing ecological harm.