I still find this perspective a bit odd. If I conclude that my factory no longer needs 20 widget inspectors to maintain its output, should I continue to employ them as widget inspectors anyway?
I mean, this is what it comes down to, isn't it? The TOCs don't think they need guards any more, and I certainly don't expect them (or the drivers) to be happy about it, but on what genuine grounds do we think that taxpayers and commuters should pay to fill a role that's no longer necessary? In theory I'm happy to accept a principled stand on safety grounds, but I really don't think that's anyone's primary motivation here. Why is "I like this job and I wish to continue doing it" sufficient justification to maintain the status quo?
For a start there is probably the hassle involved with dragging brakes or anything which needs the wheels to be observed turning. Obvs happens now with freight and existing DO trains but I'd wager it clears the track a lot quicker with 2 safety crit people on board.
Then there are the occasions where a second person can accompany you on the cab to look for OLE damage, trespassers, that kind of thing. Two pairs of eyes always better than one.
Passcom pulls on a DO train, I'd imagine every driver who agreed to DO probably regretted it on a rainy Friday night on a vomit comet. Especially if it's a 12 car and the back one got pulled.
The guard can adjust to bright light on a platform by simply adjusting their position, a monitor being stuck in place, well, that's a problem isn't it? Especially when you head east or west directly into low sun and the cleaners gave your now smeary windows a rudimentary wipe in the dead of night.
It's less a point of the TOCs thinking they don't need a guard. More the point that the TOCs thinking they can make more money and profit by replacing guards with a combo of drivers and equipment.