Were any of the people on the logs under house arrest at the time?
> What if you say, while under oath, you weren't at some of the manifests destinations, and the crime was perjury?
Then the log is evidence, but alone pretty weak evidence, definitely not sufficient for a conviction and likely not even enough, on its own to meet the probable cause standard ton sustain a charge.
> Being on a flight log is evidence you were on a flight.
Which generally isn't a crime.
> Jury's (or Judges if you don't want a Jury) decide guilt.
But, long before that, judges decide whether there is probable cause to even sustain charges, and you haven't really painted a map of anything that would suggest that that exists for anyone.
> With everything known surrounding the destination of some of these flights, It is surprising the logs didn't lead to investigations into some of the serial passengers
Making criminal investigations of particular individuals public prior to charges is generally a breach of protocol. Maybe they were investigated, and insufficient evidence to charge was found. Maybe there are still notionally open investigations stuck at dead ends waiting for a break.
You are surprised by something that is completely your own assumption.