We're not talking about "invisibility" - we're talking about people seeing actual lights in the skies at night and shiny silver spheres in the day!

These aliens have ships that can accelerate at hundreds of gs, and yet they aren't smart enough to paint them grey, and or turn the lights off at night?

Technological, extraterrestrial intelligences visiting mankind is an extremely specific and extraordinary claim, and yet there's really no direct evidence of it whatsoever.

You'd be just as justified to show this as evidence of angels, or fairies.