It's very simple, when you nationalize something, it magically becomes cheaper. Because it doesn't have to pay out "profits" to "shareholder". The way this works is that you can always get a politicians to promise whatever to whomever, as long as it will get him reelected. Then it's up the the public company to constantly pursue quick successes (usually in the form of various prestige projects which includes hiring huge swaths of overpaid and unfireable employees) while neglecting long term planning and maintenance. When called out on it, they demand a larger operating budget, which if allocated, goes mostly towards making the allocating politician look good, and which if not, results in cuts to front line services to make the responsible politician look bad. This is called "rent seeking". Because the service is lousy, and the public, while not liking that, also isn't going to deliver the required landslide in an election, nothing happens. This is known as "the reason large public companies too often become bloated ungovernable unreformable monsters".