And I also doubt any craft flown by extra terrestrials would be slow enough to be intercepted. Though I am going to admit, I'm disappointed the aliens haven't arrived yet.
I guess the aliens cannot get to Earth, especially if they have mass. Because according to some scientists, nothing is faster than the Speed of Light.
How fast is the Speed of Light?
This guy's writings seem interesting: https://www.odysseymagazine.com/how-fast-is-the-speed-of-light/
But ScienceALERT published an article five years ago that purports there are actually four cosmic phenomena that travel faster than light:
https://www.sciencealert.com/4-cosmic-phenomena-that-travel-faster-than-the-speed-of-light-science
Still, I'm not sitting at home wearing a tin foil hat.