I noticed that, and was torn (no pun intended) to comment . . . either a shame the local city feel it's ok, but a tattered USA flag is kinda iconic (to me at least, and maybe others), it sort of represents some tough times / battles the country has been through.
Almost suits the civil war era the park represents, maybe that's why it's in that state, could even be on purpose ?
Great history @RoarRoar George Washington and all, just after the Delaware crossing.