"Like 90 percent of Quebecers support this new law."

So what? In the 1930's many Germans wanted to persecute and kill Jews (to give an extreme example). Because a majority wants something it doesn't necessarily make it right. In a country where the rule of law is paramount the majority doesn't always get what it wants. 

As for Belgium, Europe has a different legal tradition than the anglosphere (which Quebec is largely, although not entirely in other respects, part of).