Well... it seems that this has mostly turned into a discussion on aliens (with a few side jabs about how some of us may or may not be tasty)... 
Personally, I'm open to the idea of aliens, for a number of reasons.
When I was a child, my grandfather and I looked through his binoculars at a strange bright light that he noticed in the night sky. It seemed to have a circle of smaller, red lights below it and held it's position for some minutes before shooting off across the sky and out of sight. Many others saw it, as well, and the newspaper reported on it the following day. From outer space? Don't know... but certainly unexplained.
I'm not a nut on the subject, but, over the years I have watched various programs about aliens on the television (usually only if nothing more interesting was playing at the time). Many of these programs feature scientific theories such as: a) there are SO MANY Earth-like planets out there, located at a distance from their suns which would support life, that it would be "highly unlikely" that there is no other life out there. b) I can't recall all of the details, but scientists also have theories on the properties that a faster than light drive would need to possess in order to be possible... though they don't know how to build a drive with these properties or exactly how such a drive would operate.
As far as the question of, "Why would they bother to come here" goes, who knows? Scientific curiosity? To watch over us?
If they exist, maybe some day someone will ask them...
