We have three cats that live in the house and hunt nothing but the food dish, the two outside cats are a mom and kitten that took up here this winter, moved under a building and I woldnt allow them to starve. I'm evil like that. Blackbirds land in a group of 12-15 at the time and raid their food, so far mom has ignored the birds and baby just watches. Well fed cats are little danger to bird populations.
Tree huggers however, protecting snail darters, are responsible for job losses, and energy dependence.