I studied the UFO/ET subject years ago as a youth, long before the internet became a thing, using books from libraries and some I purchased.
Even seasoned UFOlogists like Jacques Vallee, on whom the main character of Close Encounters of the Forth Kind was roughly based, are baffled by the phenomena and the often bizarre reports of experiences of contactees.
It seems the Earth is being visited and has been visited by many different types of extraterrestrial.
At least one, if not more of these groups, have done deals or attempted to do deals with various governments.
Some types of ET seem selfishly oriented and others more noble in intent.
Some people today of a certain kind of religious bent dismiss all these accounts as interactions with demons.
In reality, demons, apparently, are deceased humans who have sunk to a very low spiritual level.
There is no evidence that they are "fallen angels", despite this being a popular belief.
Nor is there any trustworthy evidence of the existence of a "supreme demon", such as the word Satan or even Lucifer may suggest.
If Lucifer is real then his current location is unknown, as far as I'm aware.
He was said to have led a revolution against God, and this may be so, but how this impacts on humans and the ET phenomenon is unclear.
There is no reason to believe that ETs would believe such a story, which seems to have originated with man.
No doubt they would have their own beliefs, assuming they exist, and one would hope that space travel to inhabited systems only become possible when a population clean up their act on their own planet, so as not to spread their own dysfunction and destructive behaviour elsewhere.
Unfortunately, given the fact that spiritual and technical development do not necessarily occur together, this may not be the case.
However, according to Phillip Krapf's books, which are highly recommended, an overseeing race ensures destructive ET races never get into space, by utilising highly intelligent, peaceful means, that keep such races grounded.
The human race is such a destructive race at the present time, and so we can't expect to go anywhere significant off world anytime soon.