Beyond the bird or wildlife problem, outdoor free roaming cats are just generally a problem. I have two cats and an outdoor cat likes to come and taunt them at the window: it seriously stresses them out. It’ll go so far as climbing up screens and damaging them. Cats will also often mark people’s houses.
I walk my cats on leashes. I don’t understand why cat owners can’t understand that people don’t want their cat around unmanaged.
You shared a Wikipedia link with sources[1] (and also numerous sections and assertions in the Wikipedia article itself) showing that cats generally impact wildlife populations but came to the conclusion that they don’t. Am I missing something here? Is it because you’re specifically focusing on birds?
[1] https://besjournals.onlinelibrary.wiley.com/doi/full/10.1111/1365-2656.13745
Free-roaming domestic cats affect wildlife through predation, disease, hybridization, and indirect fear and competition effects. Our review highlights biases and gaps in the global literature on these impacts, including a focus on oceanic islands, Australia, Europe and North America, and on rural areas, predation, impacts of unowned cats, and impacts at population and species levels. Key research advances needed to better understand cat impacts include more studies in underrepresented regions (Africa, Asia, South America), on impacts other than predation, and on management methods designed to reduce impacts. This review also supports past studies in illustrating that cats negatively affect wildlife populations and communities in most cases in which these potential impacts were evaluated