There are lots of anecdotal evidence that our world was already like MIB, Stargate, Star Trek, Star Wars: lots of alien contact, diverse, good and bad and neutral. The problem is TPTB/MSM /governments/Vatican/etc. have conspired to keep this under wraps.
Consider the following:
(1) Below the Vatican, there is a secret library that has documents from thousands of years ago. Some are alien based. And "disputably", some documents literally indicate that the "gods" of our current religions are actually aliens who camouflaged as humans or acted as gods to "lord over people" (Stargate).
Also, the Vatican does act as the "unbiased mediator" for alien-Earth negotiations, which I found interesting.
-I agree that I cannot point to evidence, but I have seen some accounts over the years about this.
(2) the nascent defense industry in the 1950s-1970s in US, and the tech industry in the 60s-70s:
Lots of personal accounts from people (ex. Ben Rich) who worked and supervised in Skunk Works as well as the technology industry (silicon chips, transistors and chip manufacturing) have indicated the "advances" came from either Roswell (reverse engineering, i.e. copy) or direct alien contact.
Ben Rich also indicated that the government satellites already had nano-scale "camera" chips back in the 60s, so they can see a penny clearly on the ground in color. He said that whatever technology is in the public, the government is actually 30-40 years ahead in black projects.
(3) nuclear bomb "disarming" by alien aircraft during the Cold War: if you ever find real-life accounts from servicemen whose job is to man the nuclear silos in Russia and US back in the 60-70s, you will realize they had lots of accidental (and intentional) firings of the nuclear ICBMs. This includes the Cuban Missile Crisis. They all had anecdotal accounts of outside guards seeing a flying saucer overhead, and all of a sudden an invisible EMP engulfs the area, shutting down everything right when the ICBM in the silo was about to fire. The account is repeated everywhere - Europe, Russia, USA. Keep in mind these servicemen were sworn and threatened to keep their accounts from being made public.
(4) The Moon: given humanity's penchant for exploration, and "greed" for resources/power/prestige - one might ask - why did we stop going to the moon?
Set aside the possibility that the moon landings were all fake (lol, too many people to brainwash, not to mention telescopes of amateur stargazers)....
Personal accounts (private) from John Glenn, Buzz Aldrin, the last Apollo landing team, etc. - all said there is a group of aliens on the moon who have built full cities on the "dark side", and are mining the moon for resources. There are pictures "stolen" from NASA showing these, despite the obvious blurring of the images.
During the last Apollo moon mission, these aliens literally "glared" at the astronauts and warned them never to go back to the moon.
Soooo... feel free to interpret that however you want.
(5) The "Stargate" project at Stanford: This is the remote viewing project. Lots of "RVs" of past/present/future direct alien contacts and interventions. Obviously cannot be proved by the scientific method, but if you are here on transients, you know RV is a real phenomenon just like OBE, so feel free to make your own judgement.
I could go on and on... but the above are the major ones that stand out.