I don't know it's educational system issue or purely political issue, but it should be clear for anyone with IQ above the "retarded" territory that the whole purpose of the trade, (even since thousands of years ago), is provide the best goods available in the world at cheapest possible price for "our" people. So even from a nationalist point of view, if my people get the best goods very cheap, my country wins. With tariffs, my fellow citizens get worse goods (because of less competition) at higher prices! Its completely opposite of the purpose of the trade.
We're living in a timeline that Christians support billionaires who publicly despise the poor, and nationalists support the losing position for the nation.