The biggest collective illusion
The biggest collective illusion is that we are civilized individuals.
Civilizations are many-years-long constructions.
Our civilized being is walking on top of those constructions.
Not all civilizations succeeded, though. We should be clever enough to recognize that the most wonderful achievement in Human's history was to sustain a well-succeeded civilization.
Instead of taking it for granted, we should be always vigilant to the slightest attack.