That's really a poor phraseology. The argument for wanting something like this pulled is not, "I don't like this, therefore no one else should see it either." If it were, your statement might have a point. But the real idea is that, you know, shaking babies is wrong, and therefore an app that encourages or makes light of this is something that reducing exposure to might be beneficial.
I also don't think we should have any simulated rape apps, or apps where you can own and beat slaves. To better explain why I think your reasoning fails, let's change your sentence to apply to something of a different context.
"If you don't like slavery, don't buy one."
I think your comments were well intentioned, but I stop there.
Don't delude yourself.
Yes shaking babies is wrong. No one is seriously arguing for shaking REAL babies.
BUT
Shaking an iPhone with a picture of a baby & annoying sound-effect != Shaking a baby.
And the idea of reducing exposure as being beneficial is a flawed concept.
Putting wild dingos behind the wheels of gas powered bomb & missile equipped cars and setting them free to rampage the world's highways would also be a bad thing.
Hell, I'd argue it'd be worse than shaking a baby, but no one is jumping to support Apple banning the Crash Nitro Kart iPhone app.
Additionally, Augusta Gein had the same idea to reduce exposure of her perceived evil to her children, and we all know that Little Edward turned out just fiiiiinnnnneeee.
How a child turns out has LESS to do with what they do for fun but MORE to do with how the parents/guardians raise them.
(Parent's should be deciding what content their children view, and not leaving it to corporations.)
As for your 'slavery' reasoning example, that too is flawed.
iPhone App != immoral practice.
Try again, but this time pick an
object (not an abstract concept) that doesn't at all infringe upon the life or liberties of another individual.
Cottage Cheese? Plutonium? Pornography? Scientology propoganda? The bible? Tofu?
Censoring this app just because you are offended by it is NO DIFFERENT than censoring this: