Suppose a man walks down the street with his wife on a leash like a dog. Would that be acceptable?

That's more or less the same signal as the burka.

It's NOT acceptable. It disturbs the whole of society: hence 90% support the burka ban. 

Society has a right to ban the burka as the ECHR has upheld in Europe.

I believe the SCC will uphold Quebec's burka ban.