For me I have some sympathy purely because of the wider situation. This was lockdown eve, he'd gone into work just following Boris' "you must stay at home" message and he was worrying about how on earth he was going to deal with his childcare arrangements and his work commitments:
RAIB Report
He absolutely 100% should not have been using his mobile phone in the driving cab. Indeed I'm not sure he was fit to book on and drive that evening with the level of distraction he was dealing with in his personal life. But he did book on as fit and he did use his phone so he has, rightly, been found guilty of breaches of Health & Safety law. But I can't help but feel a certain amount of sympathy for him.
I also have sympathy.
The difficulty is with such personal prosecutions (which are a low-hanging fruit for the Regulator and satisfy the public lust for revenge/blame dressed up as "accountability") is that they can work against the Just Culture approach. [Sydney Dekker has written some good stuff about this topic in aviation and medical contexts and the same applies to Rail].
And it's the Just Culture approach that underpins high levels of safety.
Before chucking "rules violation" comments around, you have to ask questions such as "what was the company policy on mobile devices in cabs" and "how did {local] managers actually approach use of mobile devices in cabs vs the official policy."
Inevitably these situations are more complex that they seem at first glance.
Also note, the position of the FOC sector as regards use of mobile devices in cabs has historically been quite different to that of TOCs. I think you will find that many if not all FOCs make extensive use of phones/tablets to issue WONs/PONs/daily notices and transmit late notice ESR warnings. Trainlists are often emailed over and comms with Control are on the mobile. In some cases, managers may expect staff to pick up (albeit in a framework of when they should/should not) and company mobile device policies may be weak. BYO device policies may also be in place. RSSB (and in some cases ORR) policies are usually orientated to the passenger sector and are not always helpful in managing a particular risk in the FOC sector vs the TOC sector.
So, in this case...... you can easily have a combination of a mobile device "on" as it gets used for work purposes, a weak mobile device policy, and a person stressed and worried. SO yes, I have sympathy in the way I have sympathy for any human being who makes a mistake, is misled by the system they are working within- and is the one who takes the hit for the whole thing.
I suggest that "there for the grace of God go I" would indeed be a worthwhile reflection for some of the hang 'em and flog 'em brigade.
TPO