JP
I'm intrigued by your choice of phrase:
I remain unconvinced
This is very similar to the phrase used by the MoD:
the Department is not convinced
My dictionary defines 'unconvinced' as 'not firmly persuaded', so this leads me to believe that both you and the MoD are, in fact, partially persuaded. If this is the case, there appears to be an element of doubt in your minds about the negligence finding.
Don't go yet, JP - a couple more posts and we'll have rescued you from the 'dark side' (and maybe the MoD too?)!