Goign back to the OP, I read it to mean that the US police would not enter into a cross border fire-fight.
I'd have thought that the jurisdiction of US police doesn't extend into Mexico, even if they are being shot at - it would certainly spark an international incident if an Irish policeman fired across the border at a British citizen on our onyl land border.
Had the Mexicans set foot in the US, I expect the police would have responded more vigorously.
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Overhead, the Albatross hangs motionless upon the air,
And deep beneath the rolling waves,
In labyrinths of Coral Caves,
The Echo of a distant time
Comes willowing across the sand;
And everthing is Green and Submarine
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