My issue is this:
In the U.S. we have a concept called "separation of church and state".
This means that no state, county, or local body can pass or enact any laws, ordnances, rules, or regulations, that enforce Muslim Sharia law.
If you don't want to transport alcohol, don't drive a cab. But more to the point, what if cab drivers started openly declaring they wouldn't pick up blacks? Or Muslims? How well would that play? Conceptually, declaring that you won't pick up fares who are legally transorting alcohol is no different than that. THAT'S the point they're missing.
This is the Pub. Leave common sense at the door.