Bear in mind that he, she or it might be going to remove an illegal obstruction, they certainly do exist.
Some can take it too far though, in the uk.rec.rights-of-way group (when it was still active) there was one rambler who boasted of carrying a machete to hack through someone's garden that was on a RoW, he said that the owners came out to bundle him off but when he waved it at them, they backed off. That kind of action can quite easily result in someone pulling a shotgun to defend themselves against the nutcase in the bobble hat who appears in their garden waving a sword!