"Lots of disadvantages here, and NO advantages, for festival-goers who do not have a dog (and for those who are considerate enough to leave their dog at home)." ..............(Sharon A)

Well lets see ..... remove all the dog owners from festivals and you increase your ticket price. I class low(sic)ticket prices as an advantage, also the friendliness of the responsible dog owning fraternity!

Folkiedave .......... I don't expect you to get this but ....
It is all about the level of danger and the risk of that danger actually ocuring! If dog bites were always fatal the slight risk that somebody would get bitten would be outweighed by the danger of being bitten! If dogs had rubber teeth and never caused harm (by biting) the risk of a dogbite would not be considered serious.
The consequence of being run over by a car is severe but the chances are low of it occurring ...... that is why you do not ban cars!