I can't wish for anything because anything that would happen after that would be my fault.
If you had a wish you basically have temporary omnipotent power, even if its only one wish.
So lets say the one wish I wish for, even if I say "oh I only want something modest and small", what you wish for doesn't matter, what matters is what you didn't wish for. Every person after you wish that dies of cancer is your responsibility, because you could have wished cancer out of existence but wished for a house in the Bahamas or something. Even if you wish away cancer, what about the other diseases, or wars, etc. You for a moment had the opportunity, if the wish was phrased correctly to prevent the vast majority of future misfortune but failed to do so, so everything falls on you.