Ken, I think you’re getting hung up on the act of choosing (or freewill) rather than the result of choosing. We don’t have anything here on earth that equates to the relationship between God and his angels, completely positive in the very least, but we do have some negative examples. It boils down to the difference between what you would do for someone you loved as opposed to a slave/master scenario (all that’s pretty obvious so I won’t go into it). Heaven is the result of chosing God and evil is the result of not chosing him.
As to all these supposedly “natural” evils, I disagree. They are only “evil” to man’s world (and the destruction of his “things”). In nature, they all serve a purpose in the maintaining of the balance of nature. Humans have gotten in the way so these will understandibly impact us, but they are not “evil.”