Venice by car?

Just got a message from AutoEurope (our preferred auto rental) and they are pushing Venice. I post the above photo I took to show all of the cars on the Grand Canal. Well. They even use boats as garbage haulers and have police and fire boats. The bus system is the Vaporetto which are small ferries.
     The only cars are in a lone parking structure at the end of the causeway.
     While I am at it, let me suggest that a car is a liability in other cities, as well. New York, San Francisco, London, Dublin, Rome, Florence, Paris are take the bus/taxi/walk cities. You do not need a car and having one is a pain. They all have great public transportation.
     For example, we fly in to London and visit then take the train to a smaller town outside of the city where we rent the car and drive the countryside and then return to the smaller place and reenter London on the train.
     Don't get me wrong, I love to drive -even on the left- but I also like to see things.