I have a bunch of bird-feeders hanging off of my deck. I figure it this way.
We humans have destroyed much of the environment on which the birds rely to survive. If I put out bird feeders, I'm replacing some of what we humans have destroyed. That is, a source of food for the birds. From what I've observed, it's aiding the entire cycle of bird life. I have small birds, t!tmice, creepers, finches, sparrows, and some larger-ish birds, woodpeckers, mourning doves, and, some a few hawks that feed on the smaller birds.
It's like a bird theater off of my deck.
I do recognize though, that once I've started feeding them, I should suddenly stop because it could lead to a decline in the bird population through starvation.