Was the Targeting of PISSI Member Sally Jones Legally Justified?

Looking at this in terms of right and wrong, I think it was justified in principle, for a reason they don't seem to be talking about. PISSI was a would-be state which held territory with an army. (It still holds a little territory though not much.) The US and UK were, and are, at war with PISSI. In war, I see no reason why one army shouldn't attack the effective propagandists of the enemy, along with its soldiers.

This doesn't apply to underground terrorist groups because they are more like a criminal gang than like an enemy state.