Humans have caused the extinction of at least 680 species since the 1600s. Another 15,000 are critically endangered and will likely become extinct in the wild within the next century.
Tall buildings kill between 365 million and 1 billion birds annually in the United States.
You asked a question about why cats’ predation on birds was often highlighted. I was attempting to be helpful by providing some of the background information that I was aware of relevant to your question.
FWIW, free-roaming cats’ impacts on wildlife is considered a human based impact since humans are responsible for the presence of the cats in the various ecosystems. Feral cats are considered the primary impact versus pet cats. If you compare the numbers you can see that cats are estimated to kill 4 times more birds than tall buildings do so I am not sure why you tossed out that particular data point.
The last link I embedded included a more nuanced consideration at how the impact differs by ecosystem (urban vs suburban vs rural vs island etc.) rather than just the raw numbers which do not illuminate where the significant versus less significant impacts occur.
You’ll note I did not advocate for any particular position or solution --just provided some information in response to your question. The situation IS complicated, but I think it’s worthwhile to examine. YMMV.