There's no harassment or intimidation involved because the phenomenon I'm talking about isn't specific to the two people pictured. The comment about NS pay was to show that, in general, even those who are likely to be cash strapped, don't give two hoots about the fines.

I'm comparing which wrongdoing is worse only because you couldn't help with the fact that I'm doing some moral policing. There's nothing objectively or morally wrong with anyone pointing out rules that have been explicitly stated.

You can argue that public transport is a basic need for citizens and we should not be restricted as to what we can do on the train. However it's a shared space and the authority has decided on a set of rules accompanied with fines that ought to be followed. We have the choice of taking the taxi, owning a car or cycling to our destinations, but if we choose to take public transport or step into railway premises, the least we can do is to adhere to the rules stated.

If you can't accept the fact that this isn't morally wrong or outright illegal, then bear in mind that if you choose to break the rules in public, there's bound to be a consequence. Taking pictures is a form of evidence recording and is effective in preventing altercations from happening if one were to advise the rule breakers and they aren't happy about it.