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Does pineapple belong on pizza?
Even if people should be free to act a certain way does not mean that they can. There are factors that may still prevent people from putting anything they want on their pizzas.
Restaurants can only serve the limited number of options that they have available with little flexibility, whether someone wants something outside of it or not.
Just because people can't eat pineapple on pizza at one moment, doesn't mean they shouldn't. They should instead jump at the next opportunity if they want to.