Some thoughts on the subject.
Can we agree that if there are indeed extraterrestrials then they have a MUCH higher level of technology than we do?

If they do then why would they be like something out of a nineteen fifties B movie? Why would they NOT be much more sophisticated?

Suppose I were to tell you that they do indeed exist?

Tardegrades.

They are extremophiles almost indestructible.. they can survive extreme heat, cold, radiation, vacumn, pressure....they thrive in every conceiveable environment...they've even been sent into space with no protection, and survived.....they have been found on EVERY continent on earth including Antarctica. There are likely hundreds of them in your back yard...they're everywhere they're everywhere..

Tiny, biological robots. Part of a hive mind , massively parallel, widely distributed meshnet, HUGE redundancy, highly encrypted, very low power but very high frequency (it appears to us to be static)...
each one of those control thousands of microbots...smaller than mites...

some are even in your bloodstream...monitoring your thoughts.... watching everything you do...and listening to everything that you say..

Can you counter that assertion?