That doesn't speak to a motive that thousands upon thousands of people across hundreds of nations, many of whom are enemies of each other and all of whom must have some motive sufficient to cause them to spend billions upon billions of dollars faking evidence, bribing and extorting and doing whatever else is necessary to keep everyone who is in on the secret on the same page with their mouths all collectively shut.
Not only is there no motive, there is no possible way to do it. It's crazy talk, Dave! There were maybe ten people in on the Watergate conspiracy to steal records from the Democrats and that bucket leaked like it had no bottom! You know why? It's because there was no motive great enough for everyone to keep their mouths shut and that was just burgluary and petty theft! You're talking about the grandest conspiracy that could be imagined stretching across thousands of years of human history all based on no motive at all. There is just no reason to tell such a lie. There is no behavior that humans, as a group, do differently because we think the Earth is a giant sphere that we wouldn't otherwise do if we knew that the Earth was flat so there's no result of this "conditoning" you speak of. There's just no benefit to the telling of such a collosal lie and even if there were, there'd be no way to keep the secret. There's too many people that would have to be in on the deception and there's way too much technology is in the hands of too many people all across the world, in every developed nation who aren't in on it.
Clete