Thank you Q!!
People are averse to any major change in general, but in my experience they (and people that manage them) nearly always underestimate the masses' ability to handle even monumental change. People can be calmly led to any new reality if the message is managed calmly and the change is driven by confident and capable hands (POTUS).
The one area I would not advocate for disclosure is in detailing the mythology under which these evil people and their power/influence structures have operated for hundreds(+?) of years. Disclosure should be complete and unfiltered with regards to the horrible methods, acts, and atrocities committed by this group, and it is absolutely necessary to prevent a repeat in the future, but sharing these evil (and stupid) people's misguided belief structure will only risk inspiring/attracting weak-willed emo-rebels to mimic their horrible acts in the future - even if only functioning as a kind of pathetic, but locally dangerous, cargo-cult of evil.
Back to managing the change; I know that you and your team already know this, but owning the narrative via the full spectrum of media/entertainment information channels is absolutely key to providing that calm, confident atmosphere for the masses to understand/accept and not panic. Leaks/lead ups prior to that point (full narrative control) will certainly help set the stage, but any risk of credible counter-narratives emerging during such a huge change will increase chances for public uncertainty → panic.
God Bless your team and POTUS!