A hypothetical mass-killing sociopath who manages to hide behind cover, convince others that he is not the killer, and calls police "acting" like an upstanding citizen, and all while still managing to shoot innocents...is going to be such a rarity it would be statistically negligible. This ain't the movies...someone bent on catastrophic human destruction isn't going to be a cool operator...he is going to go down in flames with lots o' drama. It doesn't pay to overthink the scenario too much. :-)
> A hypothetical mass-killing sociopath who manages to hide behind cover, convince others that he is not the killer, and calls police “acting” like an upstanding citizen, and all while still managing to shoot innocents...is going to be such a rarity it would be statistically negligible
Refer Graeme Burton, infamous NZ sociopathic killer. He did something very similar to this during his escape two years ago.