Almost completely agree with you Insider.
Your arguements convince me that it is better to have two members of staff on a train than just one. However, that is not quite the same thing as saying that the driver shouldn't be permitted to control the doors and dispatch the train leaving the second member of staff to control/look after the passengers. The Scotrail proposal for their new service includes DOO▸ , but not single manning of trains. The trains would be staffed by a driver and a ticket examiner.
There have been many complaints on this board about the invisability of guards on trains and lack of ticket checks / throwing scrotes out of FC‡ etc. The arguments put forward in defence of the guards are usually along the lines of pointing out the guard's safety critical role and the fact that he may be busy with dispatch etc. If the driver and/or platform staff dealt with that stuff, the second member of staff could concentrate on passenger facing duties and still be avilable and trained to do assist in evacuation and train protection in a serious emergency.
I realise that DOO is difficult to implement on lightly used routes and requires extra platform equipment, but the fact that the RMT▸ have resisted allowing the driver to open the doors (with the guard closing them) reveals to be that the resistance to DOO is at least in part driven by self interest rather than safety concerns.
I'm afraid that if the second person is a T/E they will not be trained in safety procedures so will not be able to help out only perhaps in the most basic of ways...that is the whole point of having a guard on the train! The conductor is an amalgamation of the old guard and ticket inspector combined - the ticket examiner on a doo train will only do tickets - they have no knowledge of the route, how to stop the train in an emergency, or how to lay track circuit clips or detonators, they are not trained on the routes so possibly would not even know where they were or where the nearest help would be in the case of an emergency. If they are trained to do this then they WILL be a guard!!!!!!!!!!