Unfortunately, the original local story is behind a paywall so I can't read it. My suspicion is that the real story is something like the following:
- The children experienced some harassment over the false reports that their family was responsible for canceling the play (this part of the original reporting does not appear to be in dispute, though the ADL does not address it).
- The family had a previously-scheduled vacation, and expressed some sentiment to the effect of it being nice to have some time away to allow things to cool down.
- Overzealous journalists took #2 and elevated/amplified it until it became the overblown claim that the family had "fled" town.
Of course, that's speculation on my part. Without access to the original story or more robust follow-up reporting, we won't know.