That precedent was established in the thirties (and maybe before that) when the FBI and other law enforcement agencies gunned down Dillinger, Pretty Boy Floyd, Bonnie and Clyde, and other public enemies. Not much due process in those cases. The public didn’t weep much either for their deaths.
That doesn’t wash. All these folks had been charged (and at least in the case of Dillinger) convicted of crimes. BTW, Dillinger was given a chance to surrender before he was gunned down. Regardless, it was a very different case.