Nice-sounding point, Jack; but no taxonomist would, on any tenable basis, put all four in the same category ~~ they would categorise axe & hammer together; religion & H-bomb in a separate category for each*. So that philosophically [taxonomically, indeed] your argument is - ah - shall we say? - a trifle suspect.

~M~

*& profound-sounding, superficially attractive, but irrational category-errors would go into yet another!