There are at least 3 additional intelligent(human level IQ) species living on this planet that are for all intents and purposes indigenous...........

This alone would freak the majority of people the fuck out, especially in regard to one of them that are technological on a level comparable to humans.

If the wrong things was revealed in the wrong order NPC's and the majority would do the headless chickens fighting shit-slinging monkeys dance.

So there would have to be an order to things and a progression/escalation but if done right it could work, done in any other way and, well...

There are also secrets that has a very real chance of causing both civil wars and global war between nations(imagine pitchforks and torches marching on the capital of a country and basically lynching 50-90% of the top tier of government, 1 or 2 countries would be manageable but what if there is 10 or 20 or more, what would that cause in regard to some countries seeing an opportunity in their now leaderless neighboring country.....

I don't agree with the planned level of disclosure or the speed with which it will progress but I do agree with there needing to be an ordered progression and escalation to prevent everything going to shit/riots/war over night, some things that would cause that if revealed now, would not cause this if other things had been revealed first and people had time to digest and grow accustomed to it first...

What they should do is go to the edge of what people can handle, and continue doing so until people grew accustomed to' wonder what outlandish shit will be revealed this week' became a prevalent attitude.

PTSD is less prevalent in people that have actually thought about things before they encounter them, being totally mentally and emotionally unprepared for something and having to deal with things you haven't any idea about how to deal with/process however is a different matter entirely...

If even 10-20% of a population got introduced to something that they had no ability to process because they had never encountered anything even close to it and everything would go to shit and their reactions would be instinctual, animal and emotional.

The whole toilet paper debacle should be ample proof of peoples reaction when encountering something they're unprepared for even though they are very much aware of the concept and possibility, imagine what would happen if something happened that was very real and they didn't even have a loose notion of how to deal/process.

Shit would get weird, violent and unpredictable real quick......