All I'm saying is that I would establish the situation to my satisfaction prior to issuing any ticket. I'd pose questions that could not trip up or antagonise an honest passenger.
I never once said that anyone who didn't state their point of boarding first was trying it on, although I can understand why the usual anti revenue protection crowd would want me to have said that. I'm afraid said crowd has to accept that the railway is not a museum which you can traverse without paying.
OK, no you didn't state this. But to quote you from earlier in the thread, where Old Timer was implying that there was something wrong with the passenger asking for a ticket not from their actual boarding station, you said:
RJ said:Few people who genuinely want the transaction to be done with as quickly as possible would neglect to state where they had travelled from first.
Which suggested you agreed with Old Timer, who was of that view. No-one has suggested that they would object to you then obtaining more information. That would be a good idea. The objection was to Old Timer jumping to conclusions, rather than doing this.
Unfortunately, just as not all customers are as honest as the ones here not all staff us customers encounter will be as knowledgeable as you, so I avoid giving details about my trip and inducing advice unless asked (or I know that it would/should be asked for). That's not anti-revenue, that's just common sense (since I just want to purchase a ticket for my planned route, if I don't know what ticket is suitable, I would first outline my journey instead).
Of course, I'm not trying to claim full knowledge of your job, and usually when I need assistance, staff are excellent. A little knowledge is dangerous, and I would normally avoid trying to say how staff should do their jobs better. But Old Timer asked how this situation under consideration could be dealt with better, and you/everyone else both have the same answer here - ask for more information until you can provide the correct ticket, or you have enough evidence that the passenger was trying to defraud the railway. Doesn't feel particularly anti-revenue to me.