I agree with your sentiments entirely. Giving Mary Cheney too much credit or heat is misplaced. I don't know why some folks would be unusually fixated by her case.
There's nothing more appealing and satisfying than rubbing people's noses in an "I am better than you" blanket. Perhaps some people have too much time on their hands - that tends to be the main contributor to this lamentable malady, which affects a lot of us.