It is possible they are just hoaxing their customers
it is possible they know the Ashura parade will be just like it is overseas, with real blood streaming down their faces, and a violent attitude
also, Sunnis and Shias are not really friends and Ashura is a Shia holiday, so maybe the Sunnis are planning to stage something against their own Muslim infidels?? And since the Christian/Jew infidel is not Shia/Sunni...
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I don't buy this thought.
Cabbies are picture ID identified in the back seat of the cab. Hoaxing about an event with your name and picture in plain sight is asking for a knock on the door and about as stupid as one can get.