A belief that isn't really accurate according to the RSPB
No evidence
Despite the large numbers of birds killed, there is no scientific evidence that predation by cats in gardens is having any impact on bird populations UK-wide. This may be surprising, but many millions of birds die naturally...
Animals are awesome.
Cats and dogs just have personalities that humans enjoy and are more affectionate than others. So we have domesticated them and love their company. Horses and birds are similar.... Rats and Racoons, not so much. Although i am sure some people love their pet rats.