I can understand why the journalist found it a frightening situation but maybe that was because his team had the benefit of night-vision-grade cameras.
It would be several times more frightening to, first, encounter a (supposedly) fallen tree, picked out in your headlights, then find people coming out of the pitch black, at the side of the road and rapping on your side windows (lorry height), with a big stick. Worse yet, weapons unseen but all too easily imagined.
The problem, for the police is that sending a car (2 persons) to deal with an infraction at the level of obstructing the highway, or even 2 cars risks putting the officers in the situation of being on foot, having left the cars unlocked and finding themselves rapidly outflanked by a crowd of 20. If taken by surprise, from behind they could have their weapon snatched.
Troops does seem like a sledgehammer to crack the proverbial nut but they can be turned out, in appropriate numbers and, with luck cause aggressors to back away from the situation and let drivers be.
No shooting should be required BUT the armed forces are at a permanent disadvantage in that they are expected to wait until fired upon, not fire the first shots. Retaining the moral high ground always costs one (or more) soldiers' lives.