Sure, everyone references or quotes the 1960s Brookings' Report - "The implications of a discovery of extraterrestrial life." i.e. the collapse of the three pillars of society: religion, financial system and government, with the added aspect of global panic. Aliens have made contact with a wide range of cultures around the world, from farmers (I take it this covers your 'chinese rice paddy') in desolate and rural areas, to native tribes, scientists, the military and world leaders - MUFON and various authors/ researchers have documented these encounters.

Since the 1960s and the Brookings' Report, intelligence agencies have updated their assessments: 1) based on the technological superiority, the aliens aren't here to eliminate us 2) contact with us, isn't recent - it's been a long term engagement by them 3) the aliens are interested in our DNA, as a means of gradually evolving us 4) that it's by our decision that their presence will be known; this doesn't translate as "contact," when admission by governments deem it's time.

Point 4 is important. At any time the aliens could've made themselves known, regardless of how governments felt - they haven't. Are they complicit in the silence and cover-up? Yes. The conclusion is they'd have to be. So, the 1960s Brookings Report is outdated. What's holding back admission of an alien presence? Why 'cover up definitive proof of extraterrestrial life?' As an alien race, there's no way you'd interrupt a race that's engaged in multiple wars, genocide, etc. There's a good chance we'd use their technology advances to kill each other, if not attack them. Other than disable our nuclear weapons, which they've done repeatedly, as proof that they don't want us to really eliminate ourselves, their role remains mute in the big picture.

It's all about timing. Part of any advanced race is the ability to take care of themselves, as well as the environment they're living in. Sure they can step-in and stop wars, cure cancer and fix the atmosphere - we as a people, haven't learned the most important lesson; that we're one. We need each other. We need to show that we can respectfully work and trust each other, to clean up the problems we've created; to get our house in order. We're made to feel alone, controlled and contained, by us.. by our governments, for a reason.