You're already proven wrong by reality itself. If manufacturing in the US makes more sense, Apple would've done it. Let's face it, at this point, no country can provide the volume and working culture like the Chinese. In fact, any democratic countries would be having difficulties matching China in manufacturing , simply because of the culture and mentality of the people.
I'll ask you, in which country where the citizens are willing to be kept in a huge mess hall barracks for their livelihood to work like a robot in a factory, and should be available in moments of notice? Even India is struggling with its labors. Only China can do it at the scale Apple wants.
Apple is trying. After the trade ban and covid, anybody knows not to be too dependant on China. Foxconn is putting efforts in other countries as well. But complete independence from China won't happen overnjght. It will take decades, even longer, to recreate the manufacturing prowess of China. That's assuming you have stability and no labor issues, which are frequent problems in any democracy.