How many people that aren't truckers just happen to have that kind of truck laying around for the occasional protest? Are you aware of the cost of a truck like that?
Again, all logistics are happening like normal through this whole event. Cross border traffic (despite vaccine mandates on both sides) at normal levels. National traffic at normal levels.
You can take virtually any field and find some subsection with these sorts of "beliefs". Coders against mandates. If someone smeared all coders because some subsection of HN stood honking horns at parliament, wouldn't that embarrass you?
In reality they represent at least as many truckers as are present (and who knows how many that aren't: what a union's PR department says and what its members think aren't necessarily the same thing), and presumably a large chunk of the people out there cheering them on.
If someone smeared all of a group of people for something that some individuals in that group did, I'd probably assume that their takes on things aren't very useful. I'd be frustrated to the extent that their pontificating affected my life negatively. I wouldn't be embarrassed.