Yes because it’s a return journey (and you also missed a bit the part in the thread that that particular journey I would have claimed travel expenses for anyhow).
The point here, of course, is that there is no way of distinguishing between those who would have definitely paid, and those who would have chanced it.
Penalty fares exist for smaller transgressions such as not buying before you board.
For larger offences, such as deliberate evasion, abuse and assault, we have the MG11 and the courts.
I would agree with the overwhelming majority on here who seem to feel that the OP is upset at their own circumstance , and is trying to deflect blame by criticising the system.
There's a lot wrong with the system, but this isn't one of the problems.
Buy your ticket before you board where facilities exist.
If you don't wish to do that, don't use the train.
It's very very simple.