In order to show cause and effect, you must account for the other experimental groups (nations) which were subjected to the same stimuli yet reacted differently (far less than 2.7 SWAT raids per 10,000 residents).
Again, these are different questions. You're talking about establishing a statistical model to determine whether nations, in general, would respond to such incidents the way the US did. I'm talking strictly about establishing why the US did what it did.
If your point is that America is an outlier in this regard, I agree with you! But when you're trying to establish cause and effect in one specific case it doesn't really matter what other data points outside that case say. What matters is the internal dynamics specific to that case.
When the specific causes are not unique but are shared amongst many other experimental sets, then yes you must explain why the cause had one effect in your set but did not have that effect in the other sets.
In order to show cause and effect, you must account for the other experimental groups (nations) which were subjected to the same stimuli yet reacted differently (far less than 2.7 SWAT raids per 10,000 residents).