There's pretty much zero chance of a hostile workplace lawsuit succeeding for Nazi activity, political activity is the absolute strongest 1st amendment protected activity.

It is much easier to win a lawsuit on something appealing to prurient interest since the supreme court says it is not protected.

Most people don't actually care if the people involved in making their products are murderous psychopaths, as long as you aren't putting Nazi symbols in their product or something. That's why what are essentially CCP owned chinese manufacturers run by a party that tank-rolls over people wanting basic civil rights is seen as no-fucking-problem, no one gives a shit and their sales are not meaningfully impacted.

The only reason American employers care is if they're going to get sued, unless they are selling to rich people in San Francisco or something who can afford to pay more to buy something for moral reasons.

The US government is concerned about terrorism, as they have very much been in the past. The current political climate, however, specifies forms of terrorism which are seemingly acceptable, so I suppose in this case you are sadly correct. It still doesn't fail to boggle the shit out of my mind.