I wheel and I can say that the vast majority of people know what's illegal and simply choose to ignore it. The article says that other people were telling the guy that what he was doing was wrong:
According to an agreed statement of facts presented to provincial court Judge Catherine Skene, Bertram had been warned by other campers to get his truck out of the creek. But he continued to drive his truck “up to several hundred feet up and downstream.”
I think if you're going to engage in an activity it's up to you to learn what the rules are and that sort of thing, just like we did with the fishing regs. Ignorance is never an excuse.