1. Based on the research it's clear that although crows are predators of songbird young, they are not a main predator and in fact squirrels/snakes are much more detrimental to songbird populations. Many animals eat young birds, might not be fair to penalize the crow for this! I actually hadn't held this against crows, not realizing this was a stigma some people had about this bird. I usually think of hawks and other birds of prey when it comes to eating baby birds.
3. I'm in MA where we have lots of crows and some ravens. I've only seen two here, and only identified them by their very different call. Learning the other ways of differentiating them is so helpful- especially the long shiny feathers on their chest.