Nobody has ever found the slightest smidgen of evidence of aliens, nor any plausible theory of what aliens would be like. It's about as likely as someone inventing a car that runs on water.

While it's always good to elevate evidence-based knowledge above "woo" or "belief", it's not healthy to close your mind off completely against anything that isn't currently proven. We might know that we don't know a lot of things, but the most interesting thought experiments happen in the area that concerns the things we don't know that we don't know.

... wouldn't this be a slight smidgen of evidence?