I think they would want to come here for the same reasons that we would want to investigate some other planet which shows strong signs of harbouring life. However, having seen how we have developed, it might not be too unlikely that they would at least consider destroying us before we've reached the point where we can leave our own solar system. Note: I've never even seen Independence Day. The notion that aliens would want to come all the way here just to destroy us had always seemed pretty silly to me. But upon further reflection i don't think it's at all silly now.