OK, I see what you're saying now. On first read it sounded like you were saying they aren't truckers, but you're actually saying they don't represent all truckers.

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.