Another reason I find alien visitation hard to believe is how did they find us? Out of the trillions of stars and planets out there, they just happened upon our planet and got lucky?
We're blaring out some pretty powerful radio signals. Anyone passing within, say, 60 light-years of us would have a chance of noticing them.
If so, wont they just go where the Earthlings keep saying they want to go? "Bang, zoom, straight to the moon!"