I know this will make me as popular as a fart in a space suit, but the ROE exists for a reason, and it is generally a sound reason.
Whilst we will never know how it may've turned out with CAS, we (the Coalition) killed the fewest possible non-combatants that day by not using CAS.
We serve with an unlimited liability, and sometimes that means we have people killed. The Mission is generally more important than an individual.