All the science says don’t let your cat out.

Not really, no.

Cat wellbeing doesn't say that. Cat depression rates in high enriched indoor environments neither. Keeping the cat indoors is like keeping the people forced to stay in home during Covid - it has negative wellbeing consequences.

Pointing at one specific stat and ripping it apart and claiming victory is exactly how we allowed climate change to just slip away for over 60 years now.

What the heck are you talking about? What stat? There are studies that show that the cats kill mostly rodents (Lowes et al.), and that average bird prey is old or sick. The biggest problem with bird population dropping is not invasive cat species, but invasive human species.

Bird loss is a function of habitat shrinking, climat change, pesticides and pollution. Any fix must focus on that instead of a cheap scapegoat. Do you know how I can tell that? Because the birds are dropping world wide (over 66% of bird species are in decline), outside of outdoor cat heavy areas you seem to want to focus on.

Plastic straws didn't cause the climate change.