What an interesting question, and probably nobody has answered because to say that you "would do it" ... could be considered immoral and nobody would admit to that, but to say that you wouldn't would probably mean that the person was inexperienced and couldn't actually say that they have been faced witha hard pressed critical situation. These kind of decisions, in my opinion, are in fact made everyday by most everyone, we just dont' realize it.
Say you have a platoon of military men fighting for their country, and a man is down in the middle of a crossfire. The leader, to divert the focus from his crew having thoughts of saving their crew member, shoots the injured man and reminds them of the task at hand, refocusing their attention on combat, and ultimately the welfare of their own lives. Whose to say if that's right or wrong?
Your child is in need of food and clothes and you have no money, so what do you do? You decide to rob the local convenience store, holding the clerk at gunpoint. Whose to say that you won't pull the trigger? Having never been in this position before, it's impossible to tell. So your wish would be for the health and welfare of your child while risking the life of yourself, and their ultimate welfare, as well as the lives of other and their families.
So I guess, it would all depend on your "wish."
If my child needed a heart transplant, would I push that button and make a wish? yes.
If I felt that I could free the world of illness by taking out a whole country, I'd probably push that button... Even if that meant taking the risk of losing my child with that new heart transplant, you have to consider the greater good.
Would I push that button to go to the bahamas? or for a million dollars, that coveted promotion? No...
Thanks for the great question... definitely inspires alot of thought