I think tariffs, subsidies, state-directed research and investment programs and the like are all legitimate tools of securing the national interest. No nation with an established automotive industry is going to allow China to displace and dominate that industry, nor should they be expected to. They're going to want reciprocal import/export rights, joint ventures, local production and assembly, etc. That's all fine, within reason. The American opposition is not like that, however. They're not looking to preserve the American automotive industry, they simply want to lock China out as part of Washington's spiraling, and increasingly all-encompassing and feverish xenophobic hostility that has been building for some time now and will almost certainly continue to build going forward. There is no natural limit to such hostility, and there is no win-win compromise to be found, because the entire point is that China must lose (even if USA loses also).
Trump's people, at least, are honest about this: