It is interesting that while most economies are focussing in how to move up the value chain, Trump is attempting to force the US economy in the other direction. Essentially a of my opposition to Trump's policies stem from me being a US consumer and involvement in the US tech and financial sector, I see myself being directly worse off in the future as a result of his idiotic policies. To me, that's a lot more important than issues like IP theft and China surpassing the US as worlds biggest economy or decline of US power and influence on the international stage.
Th reason is simple. The whole point of Trump being President is that many Americans are still trying to hold on to the America of the past. I don't blame them, they have spent their whole life as a steel worker, coal miner, or auto worker. They know of no lifestyle outside of such industries. But that's just how it is. No matter how powerful trump is or the US government is. They simplt cannot fight against a whole world that's moving forward.