Hmmm..an execution...of British “Iraqi” (betting Iranian BTW..given what else is playing out) refugee assets..while the French diddle trying to decide which side they going to dance with...
My thought is that he was heavily involved in some sort of clandestine activity, whether espionage or smuggling, and that he used his camping trips and his family as a cover for his rendevous, and these activities were the source of his income, which appears to have been comfortable.
So my next thought is that he pushed his side of the deal too far and he thought he was making his usual contact on this outing, but his correspondents had other plans for him and his family on this final occasion.
This is the only sort of thing that makes any sense to me.