https://en.wikipedia.org/wiki/Cat_predation_on_wildlife

In Australia, hunting by feral cats helped to drive at least 20 native mammals to extinction,[11] and continues to threaten at least 124 more.

In a global 2023 assessment, cats were found to prey on 2,084 different species, of which 347 (or 16.5%) were of conservation concern

https://en.wikipedia.org/wiki/Feral_cat

The home ranges of male feral cats, which are generally two or three times larger than those of female cats, are on average under 10 ha (25 acres), but can vary from almost 300 ha (740 acres) to under 1 ha (2.5 acres).

I've personally witnessed one of my cats well over a mile from home back when they were allowed outside.

I like how confidently incorrect you are.

You’re rearranging the deck chairs on The Titanic. If it makes you feel better, knock yourself out.

I wholeheartedly agree that humans are invasive, but one need only look at a place like New Zealand to see how one of homo sapiens' most environmentally-damaging qualities is that it brings other invasive species with it. Treating birds at bird feeders as if they're all invasive is deeply reductive and objectively wrong. Animals migrate in some cases hundreds of miles in a day.

Cats are universally deeply invasive once feral, and humans letting those cats (and dogs) get out has been the primary threat to the wildlife of New Zealand. Not humanity itself. This is almost universally true on any island, from islands that have been completely taken over by rats, to the Spaniards' tendency to leave behind feral hogs that outcompete even the most deadly of predators within a couple generations. But in only one case does everyone treat this like it's some endearing quality: outdoor cats.

Just because there's a much bigger problem doesn't mean that the small one doesn't exist. That's just whataboutism. ALL of these need to be dealt with, but you know which one is the easiest to tackle FIRST? (Hint: it's not the pigs)