I mostly agree with most of what you said. I am not myself a Trumpist, more of a moderate who sees some good and some bad in what he's done, but the Trumpists I know think his trade positions are bad ones. They are clinging to a silver lining of the hope that some short term saber rattling will produce better deals in the long run, especially vis a vis Chinese IP theft, bullying of foreign companies, and so forth.
But tariffs are bad. Not just because they hurt OUR exports, but because imports are good too. As you point out, imports help consumers...both individuals and businesses which use imports as inputs into their operations. And subsidies to counteract the impact of those tariffs is doubly bad. On that we agree.
But it's even worse than that because Trump is starting to do through tariffs the same thing Obama did via hyperregulation - scaring investors. Businesses don't know how to construct their supply lines because tariffs are changing so rapidly. Business investment tends to sit on the sidelines when faced with uncertainty. It did it for 8 years under Obama which is why the recovery was so tepid. It's starting to do the same under Trump after two years of strong economic growth driven by the freeing up of that capital.