Tariiffs is just a tool used by Trump in an attempt to excercise coercive control over whatever country that he wishes to target. One of his main go-to methods of trying to bring them to heel or in line with what he wants.
A simplistic approach based on hard-nosed hostile business practices. But then, bully-boy tactics and a quid-pro-quo way of thinking is obviously what he goes by, shitting all forms of political diplomacy straight out the window.
Yeah, it's the citizens within the US who are going to get hit hard by the fallout. Recently Trump admitted as such even though previously he claimed people within the US would be benfiting from these Tariffs.
Thing with Trump, he doesn't give a shite if people are hurting. That's just not on his radar. It's all about him, his ego and his showmanship.