Then we decided that they were not grateful enough for all that we compassionate Americans have done for them, so we forced them into honoring us. They might like some of what we did for them, but not all and not the way we did it. Now lets try to equate that to man and God. This will break down pretty quickly but hopefully it will get my point across. God could do away with all the evil in the world, but to do so He would have to take our free will away from us.
People do evil because that is what they want to do.
You may not believe that, but until you have spent a couple years on an ambulance crew or as a Police Officer you don't know. The LORD saw how great man's wickedness on the earth had become, and that every inclination of the thoughts of his heart was only evil all the time. That is all of us, we long to do evil. You don't have to teach a child to lie, it comes natural, you have to teach them to tell the truth. You don't have to teach them to be selfish you have to teach them to share with others.