You do know how difficult it is to destroy a biological weapon completely?
(Obviously some are weaker than others.)
But there needs an incredible degree of heat to burn consistently for at least 5 minutes over the complete strike area AFTER it has burrowed 10 feet under ground through a house, and smashed an incubation vault that is especially made to make sure that nothing gets in and nothing gets out.
Mind you this was in a foreign nations embassy on a complete different foreign nations soil.
This may have been a CIA mission, or some group to that effect, because it was necessary, but America did not have a legal leg to stand on when taking responsibility for saving the world this week.
They weren't even sure where in the world the biothreat was going to be used, but they risked starting WWIII to deal to it, when it could have just as easily been used against America's enemies after it was sold.
This is the sort of shit I expect from an 80s episode of McGyver or Intelligence.
The nature of Arrow is theat the hero has to be the hero and the hero is more of a hero if they buck the oppressive and evil system claiming to be good, so Amanda got bucked.