Earlier quoted context omitted.
That's true, but supermarkets compete with one another on price and other factors. They are motivated to do things to get more customers. Yes, there are many cases where supermarkets have been bad actors, but that's solvable with competition regulation. Water service is very different, and the current setup in the UK seems pretty insane - you can't have competition on who supplies water to your house. People aren't g…
Railways are another example of competition not being possible and where privatisation makes no sense.
https://en.wikipedia.org/wiki/Privatisation_of_British_Rail#...
Traffic dropped a lot in the Great Depression but stabilized immediately after, and remained stable right up until nationalization in 1948 at which point the network entered a period of continuous decline, eventually falling to a level of ridership last seen in 1865. That is a staggering failure.
The moment the railways were privatized ridership starts going up again, despite the privatization not being complete and being unable to roll back the huge damage done under the decades of state ownership (before nationalization the railway companies were entirely self sufficient, which they no longer are).
So to argue that privatization makes "no sense" you have to ignore the fact that when privately managed usage of the railways goes up and when run by the state it goes down. If the goal of the railway is to be used, then it does make sense.