Indeed. It doesn't do the industry any favours.
When it comes to safety, some branch lines are at real risk of becoming unviable due to the disproportionate safety and staffing requirements, and the alternative is a bus! A DOO train is far safer than road transport.
Many passengers already choose not to use a perfectly viable rail service and instead save money by taking a bus/coach, which is nowhere near as safe as DOO rail.
I'm against the idea of trains only having one member of staff on board, but the idea that it must be a Guard (who may be highly visible, or in some cases may be in the back cab all journey), and not a ticket inspector patrolling the train constantly (without having to pause to do doors) isn't an argument I can accept.
It's interesting to see how things change over time. Half a century ago, the Guard was playing an important role in making some branch lines more economic to operate (no doubt saving some from closure) through the Paytrain concept, allowing stations to become unstaffed and so on. I'm still convinced that the Guard is in the best position to do that - as long as he's able to carry out his station duties from any part of the train, and not restricted to the back cab. It's not very often that I've seen a Guard struggle to get through the train working in this manner; indeed, I've noticed that many make the most of their station duties by seeing who gets on the train and where, so that they can target their revenue protection activities more usefully

. I remember one Guard, on a busy (relatively) Barton line train observing 17 passengers boarding at either Ulceby or Habrough, but only seeing/selling 16 tickets as he passed through the train - would an RPI, less aware of comings and goings, have picked up on the potential fare dodger?
On that basis, leaving the Guard to operate the doors seems to make sense (and avoids the hefty investment that'd be required to achieve otherwise) - but either way, I'd like to see the provision of a second safety-critical member of staff remain a
requirement (even if they do lose control of the doors) rather than something that can readily be dispensed with to save the TOC a bit of money here and there.
I do agree that we - and the RMT - aren't doing the grade any favours by concentrating on the worst imaginable catastrophe of a scenario. There's no doubt that there's more risk of something going wrong (or going more wrong than it otherwise would), but the probabilities involved are so small that it's difficult to argue convincingly! I think it'd be far more helpful to look at the roles of the Driver and the Guard during more routine activities - up to and including a train failure, not an uncommon event - and consider the 'customer service' aspect too.