I'm still waiting for someone to explain to me why a public monopoly is better than a private one.
in an ideal world we wouldn't have or need monopoly's however private monopoly almost always only benefit those with the biggest shares. Where as an public monopoly servers directly or indirectly the people who also pay for it.
As the name implies funded with public money for a public cause. In addition if the government is involved in founding and funding they can also be involved in policies like a salary cap. That is an important detail because if you look at where it goes wrong(with Thames water and others) then it's not the cashflow/general running of the company it's how the money is spend. Currently it's used for rewarding shareholders, do you think that's an good public caise?
However we do not live in an ideal world so we need way to ensure public money is used for public causes, i heard you say something about regulations earlier, well they failed, in both the Netherlands and the Uk, so maybe it's just isn't the way to go. The main problem in my view is any private company will sooner or later start with making unreasonable growth prospects and that's usally how the spiral off attracting external money starts, who in turn want that money back and that money not spend on public causes all the while the growth prospects are an lie.
However for things like clean water supply and also waste water and more utilities i think a government monopoly isn't, i think the government should at least own the network, we seen when the electricity prices where going to the roof a few years back that France was'nt impacted that much as they own their infrastructure. (and didn't close all their nuclear plants without thinking like Germany did.)
So that's an clear example of the control the government has if these things are kept in some sort of monopoly. although politically i believe the government should have less duties rather then more, i also think control over utilities is important. Netherlands roads would be just as crappy as here and the whole country would be flooding if the road and water management wasn't government owned, because the government based water and road company sits on a pile of cash, that is now only used for road maintenance and water projects or better said it's use but in private hands that would go the the shareholders and said project postponed or financed.