I do not claim that he has diagnosed any specific problem correctly. But understand that I am not and have never been a free market Republican. I have always fallen in with the Democrats, at least until the last decade or two, in supporting protectionist trade policies and private sector unions.
I have seen interviews from the 90s where Trump railed against the unfairness of our trade with China. I'm also aware that until shortly before he decided to run for President he identified as a Democrat. Putting those long term facts into the equation, I suspect that he has a sense of China eating our lunch without a clear understanding of all the intricacies. I can relate to that.
If lashing out with tough rhetoric and wild tariffs is his reflex, well, that's a lot better way of addressing it than literally any other President has used. I think someone on this board posted a nice twitter thread about the problem of dealing with China's policies. We can't respond in kind to their theft of IP, or manipulation of currency, or manufacturing subsidies. Tariffs are the club that is being used because there really isn't a scalpel.
But to be clear, I would love the protectionism even without the China problem. I see free trade as a boon to the top tenth of a percent at the expense of the lower and middle classes. College economic theory disagrees with me (and our nation's recent history), and I'm okay with that. They'll get tired of being wrong eventually.