While Israel tries to defeat Hamas, they also have to worry about a much more dangerous paramilitary group on their northern border: Hezbollah. The express purpose of Hezbollah, which formed 40 years ago, is also to eradicate Israel. It would be a nightmare for Israel if Hezbollah swings in and backs Hamas up. So where did Hezbollah form, why do they hate Israel, and what hand did Israel have in their creation?