Re #2 -- locking Chinese vehicles out of the market will also lead to the downfall of our industrial base over time. In general, Americans (including those who work in US manufacturing) do not understand that Chinese vehicles are very competitive. At some point, those vehicles are likely to surpass domestic capabilities (they are already there viewed through a price/performance lens).
All of this is down to the simple fact that essentially no American has ever driven a Chinese vehicle and does not know anybody who has. They are not even getting secondhand reports. This is worse than the '80s when the Japanese makers arrived in the sense that in the '80s everybody could see the quality of the Toyotas and assess quality/performance for themselves. It's much worse to not even know how good the competition is.
From a business standpoint, it's especially bad for the domestic industry because the majors actually do need to be competitive in fast-growing regions like Latin America, Asia, and Africa. It's not a viable strategy to depend on protectionism at home while ceding countries where most people live.
Everyone's take on the 1980s has been perverted by an internet viewpoint written by a bunch of weeb fanboys projecting the state of the car market in 2006 onto 1985. The actual cores components of the cars themselves are basically within spitting distance for Japan vs Domestic. These were not high quality cars. They were all low quality cars. But Japan was making the king of low quality cars that people wanted. (And by 1990 all these early 1980s platforms from all makes were all comparatively trash).
In the late 1970s early 1980s if you tried to buy a compact american car it was like buying the burger at a fish restaurant or the vegetarian option at a steakhouse. It was there to check a box. It wasn't well thought out or a core product they gave a shit about and they were almost always last to get any innovations. You want power widows AND an automatic, sorry we'll have to special order that, we don't stock those on the lot.
In contrast, the Japanese gave a shit about those product lines. So someone making "In better times I'd be buying a bigger car from Chevy" money could go to them and get something configured how they wanted without being told no a bunch of times and the sales guy trying to get them into something bigger car didn't want like would happen at the Chevy dealer. Toyota or Honda or whoever literally didn't have those products to upsell you into. Yeah I guess they could sell you a landcruiser but people didn't buy SUVs then. That would be like trying to sell an Econoline to some rich woman who's shopping for a 3row Landrover.
At the end of the 1980s the domestics were basically back with their own new "modern" FWD platforms (e.g. Taurus) and new larger stuff (minivans, midsize SUVs) which made money hand over fist for 10yr or so. The Japanese were basically on the sidelines for all of this. Like yeah they had the 4Runner and Pathfinnder and Passport and stuff but no amount of 2020s fanboyism is gonna make those sales numbers any less of a joke. What the Japanese did do very well though was give a crap about their smaller cheaper offerings, Rav4s and CRVs and small and midsize sedans which the domestics neglected. So when the SUV craze came to an end with the high gas prices and bad economy of the mid-late 2000s they were there ready to be bought. And it's this great success from the mid 2000s that every idiot on the internet seems to want to project back into the 1980s when the 1980s were far different.