I think you must have misunderstood the media reports.
The PTA subsidises, and therefore loses money on, every single train passenger it carries, no matter whether the train is running day, night, weekdays, weekends, whenever. So if the government is running trains very late at night, the government is losing money, not earning income, on those trains, even if it is charging a fare to the passengers (which it isn't at the moment).
Train operators do not run trains so that 80 or so passengers can go on a train ride and the operators can feel the "love" (to use your expression) from those passengers. The operators run trains either to make a profit, or to provide a means of transport that is considered to be a worthwhile service to the public, bearing in mind the cost of subsidising that service.
What the government has now decided is that while it can justify paying the subsidies it pays in relation to most suburban trains, it can't justify continuing to pay them for the late night services it has been running in the last few years. The main reason those trains can't be justified is, apparently, that they are very poorly patronised except during the summer months.
So anyone wanting to advocate the continued running of these trains should really be trying to convince the PTA to run them more sparingly, eg only during the university summer holidays, when more people are out and about very late at night.
The other significant question arising from the government's recently announced decision is whether the government can justify continuing to run the AvonLink despite its low patronage when the government will no longer be running late night suburban services due to low patronage.
Of course, cynics would say that the real difference between the AvonLink and the late night suburban trains is simply that the AvonLink serves a handful of country parliamentary seats represented by government MPs willing and able to talk the government out of running buses instead, whereas so few electors from each suburban parliamentary seat really want the late night trains to keep running that no government MP is going to make much of an effort to keep them running.
Other cynics would say that even electors who live in country electorates, and procure their local members to lobby for the retention of country trains, are far more interested in the idea
of being able to catch a train than in actually going ahead, paying the fare, and riding
on a train. According to those cynics, that's the real reason why those electors kick up such a fuss when the government announces that such trains are to be canned, and also the real reason why the government continues to pander to those electors by eventually reversing such announcements.