The OP asked for a steel man argument about why tariffs are a good thing. The response you are criticizing did actually answer the question, if you read the first paragraph.
The second paragraph is honest opinion. It’s also, IMO, a reasonable one given the people who surround Trump and his seeming inability to explain why he has levied the rates he has on a number of countries.
I wouldn't consider that answer even close to a steel man. This has turned into the reddit threads where the OP asks for the opinion of people who have a specific experience or background, and all the repliers who chime in write about how much they hate those people.