The worst thing that could ever happen to a person is to acheive their hearts desire, and find out that it isnt what they thought it was or it doesnt work or it doesnt really change anything.
And if you go looking for your heart's desire and you have to look further than your own back yard, you probably never lost it to begin with.
And don't elect witches or flying monkeys to high office.
See Dorothy Gale was right.