Yup. This probably explains everything.  (Well maybe not why Trump doesn't seem to understand what a tariff actually IS):

"It has never been entirely clear why Trump has a thing for tariffs. My guess is that he sees everything in terms of winners, losers and punishment: If we buy more from foreigners than they buy from us, that in his mind makes America a loser, and he wants to punish foreigners by making them pay for access to the U.S. market. Whatever he’s thinking, restoring the good old days of high tariffs is one of Trump’s key policy obsessions, and high tariffs are very likely to become a reality if he wins the election."