Assume an honest mistake and issue a PF? As I've said before that to me seems a sensible compromise. Or maybe there should be a database where you take names and addresses and you only go through the courts if the same person has done something two or three times.
It's probably just my personal outlook on life but to me the moral wrong of putting someone through the courts, and the attendant worry that they might get a criminal record, when they did *not* deliberately set out to defraud the railway means it should never, ever be done unless it is fairly obvious that intent to defraud was there.
Everyone on this thread, I'm sure, has, out of the context of the railway, slipped up from time to time and forgotten something, run late, or whatever. People make mistakes, it's part of being a human. I'm sure most would accept a moderate consequence similar to a PF for making a mistake, but few would want to be summonsed to court for these sorts of things.