Yes, I find it difficult to understand why anyone old enough to remember what British Rail actually was (or capable of e.g. reading Wikipedia, to find out what it was), would like British Rail to be resurrected in anything like the form it had. It feels like pointless nostalgia most of the time; double arrows, rail blue, and jumpers for goalposts.
And like, if one's model for maintaining a system depends on having a sensible government in power, _regardless of which particular political party you think is least competent_ you are going to have a rail system being run incompetently at least half the time. That's also what we got with "privatisation", of course; why would we expect any different?