Papadopoulos "crime" was he told the FBI the wrong date of a meeting he had.
Just like most people don't even realize that "Russian collusion" primarily means the hacking of John Podesta's email account to show that the DNC colluded with Hillary Clinton to deny Bernie Sanders the nomination.
Certain details don't really help the narrative.
I can’t remember what I had for supper last night. If the FBI asked me that question today, and I didn’t give them the right answer, I’d be charged.