"Why not present more than one theory? How does that hurt anyone?"
I know what you mean. really. But it hurts the children. what should be of primary importance to a science teacher who's grappling with this issue is this: in the world we live in--for better or worse--people who question evolution are perceived to be a little outside reality. I'm not sure if it matters whether or not that's a fair perception. What matters is this: Why would a teacher actually go ahead and teach children something that could only make them appear really really really uneducated?
Are you serious about what you are saying, or are you being facetious?