What is so "abysmally stupid" is your attempt to use a definition of a term created by gun control activists as though it were an accepted term and definition.  You realize, of course, that when the police shoot 2 or more criminals in an attempt to provide safety and security for the populace, or a homeowner shoots two or more invaders of their home, that the definition you are using for "mass shootings" has been satisfied, yes?  Intentional distortion of the facts to bolster a political argument is, indeed, an "abysmally stupid" tactic/