Alcohol, Dogs, and Muslim Cab Drivers

Apparently, significant numbers of Muslim taxi drivers in the Minneapolis-St. Paul area are refusing to transport people carrying  dogs or unopened containers of alcoholic beverages. There is a lesson here, but I am quite sure that liberals won't learn it, until they learn it the hard way.  It is a simple lesson really: social harmony is difficult in any event and is made especially difficult when large numbers of people are let into a society who (i) have wildly different values than the rest of us, and (ii) have no intention of assimilating.