Now, I'm not sure why anyone would want to buy that app... But seriously, people who shook their babies are the ones complaining about this app? Shouldn't they be in jail or something??
Seriously, I don't think this app is all that bad, it just needs to carry a message. Wouldn't that be a good tool to get the message across to new or expecting parents? Shake the iphone but instead of just two red Xs on the babie's eyes, splash a big message on screen saying : YOU JUST KILLED YOUR CHILD, NICE WORK DOUCHEBAG! NEVER SHAKE A CHILD!
You could also add a feature so that you could make the baby stop crying by gently rocking the iphone, sing to it (it has mic). Sounds corny, but most people who have an iPhone spend a lot of time dry humping it anyway.