It's unbelievable. I don't even think that people really believe that kids are better off dead than adopted; but they don't want to have to endure the social discomfort of having everyone know they're pregnant and aren't keeping the child. And hey-----it's legal to kill the little bugger so why not take the easy way out?
Not wanting anyone to know they're pregnant is likely a large part of it, too, I guess they don't want to admit THAT. It's just twisted.