> Why not keep an open mind and be scientific about evaluating it?

I am for keeping an open mind, scientifically speaking. Entertaining theories rooted in fictional fantasy is not that. There is zero scientific evidence of technologically advanced life outside of Earth. It is a hypothesis that is just as unsupported as anything anyone might make up on the spot. Just because it is a hypothesis people want to believe doesn't make it any more supported than a hypothesis that it is the flying spaghetti monster.