IMHO: The possible reason the highly superior extraterrestrials from distant star system(s) have not revealed themselves to us is simple:
We have not passed the most important test of our biological evolution.
We have yet to grow beyond our infantile, tantrum-tossing childhood.
To grow and evolve into an adult, aware, and awake species, we must abandon and delete from our time twisted genetic programming, all the fear-driven, self destructive, xenophobic, hateful, self centered, greed and power focused ways of thinking and living such as but not limited to – separatist, divisive religions, toxic politics, bloody war, insane slavery, juvenile prejudice, caste systems, medical and prison industrial complexes, the burning of finite fossil fuels for energy and their associated land, water, and air pollution, resource wars, habitat destruction and so much more of the fear and greed focused genes still stuck in our DNA that feeds these ancient toxic behaviors. They worked for us in the dark past of our early ancestors, but evidence suggests they do not have a place in our genetic code any longer.
Now is the time we must choose not to fear and fight, but to respect and coexist with each other.
This will not happen anytime soon, and possibly never. Current events suggest we may forever remain infants in our development as a species.
We may be just another failed evolutionary experiment…or a virus that just has to run its course before the planet can heal and make room for the next attempt at something unique.
No matter what the case may be, I know that what we are doing to ourselves, to each other, and to the planet that supports us – cannot end well unless we all work together to repair the heinous damage to the system, delete the current systemic infection, and strive to learn from the mistakes of our childhood, and never ever repeat them again.
Consciously choose to do good things.