It's not quite as bad as you make it seem. Yes, crows prey on nests with eggs and young. They also prey on adult birds. As do most predators you can name: snakes, opossums, cats, etc etc.

They themselves are prey, with only sbout half of all crows making it to adulthood. Rarely are they responsible for "wiping out" other species. They do it sometimes, rarely, but it is not more so than other predators