What more is there to say. No one has found there to be any increased risk of DOO over Driver Guard despatch. Do you not think if it was less safe ASLEF would be saying so ? The upcoming ballot just says that DOO should not be extended without out their agreement. No mention of safety.
Even the RSSB's own study states:
DOO does not create additional undesired events but may increase the likelihood of an event occurring or increase the severity of its consequence.
The risk level of each undesired event will vary according to platform features, rolling stock, driver behaviour and passenger behaviour and passenger flows.
And again DOO self dispatch via CCTV is inherently dangerous - as I have pointed out.