The basic argument seems to be that Quebec's Bill 62 excludes niqab-wearing Muslim women from mainstream society and sets them apart as the "other," outside of the norm. 

I would counter that with the assertion that Muslim women who wear the niqab are already setting themselves apart as the "other," and are making a statement that it's their choice to be outside of the mainstream culture and everyday society.  

Being free to practice your religious beliefs is one thing; wearing your religious beliefs in public every day is quite another.