Let's say you are in a country where lots of people carry guns, like the USA. You are in a shop, and the shop is robbed by an armed robber with a gun. All he wants is money and not get caught, and everything goes alright, until he spots you with the fake gun in your pocket. He sees the danger in the situation and shoots you. And you can't defend yourself with your stupid iPhone case.
Never carry a fake gun. Personally, I think you shouldn't carry a gun at all, even where it is legal, but by carrying a fake gun you get all the disadvantages and none of the advantages of carrying a gun.
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Guns are a major contributor to suicide in the USA. Not to suicide attempts, but suicide attempts with guns involved seem to be "successful" more often.