Look - please understand before posting yet more of these anecdotes that there were other police officers in Palace Yard. Masood was trying to chase them after stabbing PC Palmer but armed units came and shot him.
This was not a case of Mackey leaving PC Palmer alone to die, or driving off and leaving the scene whilst the attacker was on the loose. To compare him to someone who left a member of the public to die is both very inaccurate and very unfair.
You are basically attacking Mackey for not putting his life at risk needlessly, which to me is wrong.
I'm criticising him because he locked himself in his car and didn't uphold the oath and for me, I'm sorry, I personally find that it doesn't lie very well at all.
The fact there were other officers is irrelevant and even more so, for as you put it, he was attempting to attack his colleagues; I don't see it as a needless risk.
I see it as the risk of a constable and even more so the risk of a good senior officer. You may say they're anecdotes, but I'm trying to suggest that as a constable...
... it was a fair expectation that you would attempt to confront an individual or put yourself at great risk, even if you yourself were unarmed. Maybe that's changed.
For all his faults for example, which there were and still are many, Bettison on numerous occasions would confront violent individuals while having no protection.