I think your response is a fair position, and we'd need to agree to disagree. However, I will pick up on this paragraph. While I think it's got a lot of truth in it, I think the role of monopoly is valid - and has a bad history going back into the 19th Century. The railways have a long and ignoble history, at least to Captain Mark Huish, of treating their paying customers as an afterthought, and using their monopoly power entirely selfishly (and, no, they are not unique in that!).I would personally put this down to cultural and institutional attitudes rather than the state having a monopoly. Britain and the Anglosphere in general (from my point of view) seem to think of railways as costly relics of the 19th century, partly evident by the DfT's desire to reduce subsidy and shift the cost onto the user rather than the taxpayer. It's not helped by the fact we're trying to run a 21st century operation on 19th century infrastructure without the political will to build new railways.
This trait has remained throughout railway history, to varying degrees. We are seeing a resurgence of this at present, wrapped in the sheen of public control and accountability. This relies for its effectiveness on the lack of a comparison point - which is one reason why I am with @Snow1964 in regarding the continued existence of OA operators as essential - and the hostility to them from DfT as a sign to fear