Restaurants as public toilets

Why do people assume they have the right to enter onto private property and use the toilet just because that toilet is located in a restaurant?
Perhaps it’s all part of the me-me-me society in which the only thoughts some people seem to have concern their own needs and wants whilst showing little respect for the needs or indeed rights of others.
Considerable sums of money go into buying and or building restaurants to attract customers who pay for the services the restaurateur provides. Part of those services is use of amenities including toilets which the proprietor pays to have cleaned or indeed clean themselves. The simple fact of life is, that cost needs to be returned through customer purchases.
When a person has the temerity to walk in to a restaurant just to use the toilet they not only demonstrate a complete lack of thought for the restaurateur, they clearly label themselves as me-me-me people.
Restaurateurs are not evil people holding the world to ransom over using a toilet, just sick of people without thought for others assuming they have the right to access private property for their own bodily functions.
The solution is simple. Buy something – anything. Become a customer! Either that or advertise your own residence as a public toilet.