I agree with this editorial.  The Quebec government has failed to convincingly explain what problem this law is supposed to fix.

It also sets a very bad precedent in two ways.

One is what's next?  The Sikh turban and dagger?  The Orthodox Jewish black hat and coat?  The nun's habit? 

Second, by passing such a law, it legitimizes to citizens and public servants that they can openly discriminate towards certain visible minorities.  "Go back to where you came from", "You're in Quebec now, you should dress like the rest of us".  And this is difficult to roll back.

All for what?  For votes.