There are many hundreds if not thousands of people out there every day who don't pay their fare. We see a tiny tiny fraction of them on here. There have been a few recently, but then there are weeks without any: I guess that's just the way it goes.
I concur with NajaB. The majority (maybe 4 in every 5) of people we see on here have made a one-off mistake, some innocently (misplaced tickets, not understanding the system) some with greater culpability but who recognise their mistake (a typical one is those who've asked for a 'short' ticket at their destination) and some through laziness (the 'I arrived too late at the station' crowd). Of the remaining 20%, most are chancers who've had it coming to them, and maybe 5% (about 1 in every 20) were actually in the right and are being ripped off in some way
(see here for example).
From my perspective: none of us are perfect, and most who we help are facing an area they know nothing about, where the choices that they make can have huge consequences in ways that people may not expect. Laying out some of the facts in a clear way, which is frank but sympatheic, can hopefully make the path to an outcome which is suitbale for both the 'offender' and the TOC a smoother one. And where we see several cases a year where genuinely innocent people are being threatened with prosecution, we've got to accept that to help those people, we need to deal with the vast majority who have done whatever it is that they are accused of!
It's also, frankly, interesting to do and to continue to find out more about the law and ticketing practice. I find a satisfaction in hearing about cases which end up with a situation where the original poster has learned something and can move on with their lives, while the TOC has also been suitably compensated if required.
It's notable that the nurse you reference has only received 3 replies, much lower than most threads: I think that tells you that people who come on here having deliberately and repeatedly evaded fares on multiple occasions, with little to no remorse, will receive very little help or support.