People are going to be impressionable regardless if the current majority enforces its stance on something or not. This includes well educated and well off people like you or me a lot more than many would like to admit. In the end this is a great method for preserving the status quo but it does nothing for answering the actual question of how we can reliably chase truth it just says to trust the currently written truth - something we often find to be completely wrong or intentionally misleading throughout time and location.

A shorter version of the above might be: If a method only tells us what was undebatable is so it's not really all that great a method it just happens to be right (to the best of our knowledge according to actual methods) in the completely obvious cases like the holocaust.

As to what's a better quick answer? Well that's the million dollar question but it doesn't mean any other answer we have at the moment is inherently good.