After reading the comments I don't think this is nefarious either. But it does surely indicate they are anticipating some sort of control response to the visitors... if necessary.

Thinking like a bad guy here: I would do something big that is a complete narrative game-changer. Something to completely supercede the trucker's reason and needs for being there to protest. A few hundred dead bodies (or insurectionists) would do the trick. I realize this is a sick thought, even so... just trying to think like a bad guy and as we know Trudeau's handlers might be feeling quite desperate at the moment.