Well to balance that POV in the very rare instances like this I have heard of the upset passenger is usually pretty instantly off the mark bringing matters to the attention of the crew and the crew have intervened on behalf of an agreived passenger if there have been allegations of misbehaviour.
In this case it appears the lady involved made no complaint to the crew in flight...didn't hit the call bell or head for the galley ....but then walked up to police at the arrival airport (home turf) and only then raised a complaint?
Can you perhaps see why some people are just a bit sceptical, or at least not rushing to assume the lady's version of events is perhaps the whole truth, though it might be?