I get the distinct impression probable cause isn’t required anymore in the USA from the reports we are seeing here.

Freedom for me but not for thee

They can still make your life difficult though. I think the better option is don’t fly into or through US territory if you can help it.

besides the illegal stuff

That’s a slippery slope. Illegal in which country?

Something you (or I) may find perfectly fine could be heavily pushed back against and illegal in another legal framework.

Look at how abortion / LGBTQ+ rights / gun ownership / personal drug use etc etc etc change country to country.