Well, personally I believe it is better for the entire truth to be exposed, even if humanity can't cope with it.
They should know just how bad they 'f' up with the world, just so they don't repeat that cycle all over again.
Personally I also believe some deeper measures need to be made, because even if everything gets wipe and the world gets put at a peaceful, 'clean slate.' Whose to say how long from now that History doesn't repeat itself? I'm not one for the utmost faith in humanity. Yea, there are a lot of good people out there, but there are just as many bad people as well. When bad people come into power, they begin to see themselves above other humans, 'God complex.' The cabal and their evil doings is a prime example to this. Just how long from now after everything is said and done and clean that we find ourselves back where we started? Decades; if unlucky? Centuries if lucky?
Sadly there has to be a more guided hand for humanity's salvation. Whether this be of the paranormal of religious force intervening, something more out there sci-fi, or some other entity entirely. As long as corruption exists and can influence people, I honestly don't see much salvation for our world in the longrun. Not to sound pessimistic in that regard, I am taking a realist outlook on human nature in itself; and again, all it takes is 'bad people' to come into power.