If tariffs were simply a matter of "whether or not we hurt our own consumers", there would be no debate about them anywhere; nobody would have any particular motivation to impose them, whereas in the real world it's clear there's some motivation that causes at least some imposition of tariffs to be nearly universal. Without implying any particular position is right, that's beyond an oversimplification that leaves you completely unable to look out into the world and even propose a theory that explains the current behavior of all the players, let alone validate one as correct.