If any part of your plan involves the words “nobody could be that stupid”, please be prepared to be proven wrong at any minute at a moment’s notice. Pay in mind that the person determined to prove you wrong may already be aware of this assumption, and is already approaching your current location at an alarming speed.
Similarly, “If everybody would just…”
No.
Everybody will not just ____. Never, in the history of the world, has everybody coordinated well enough to just ____.
It literally doesn’t matter how you intended to finish that sentence. You’re going to have to accept that not everybody will follow the plan, even if it really is a good idea.