I think that the risk of being imprisoned without due process is very low, but still substantially higher than in any other Western country, and certainly high enough not to justify the risk.
I also think that the risk of being temporarily imprisoned with due process, until they figure out that I haven't broken any law anywhere, is also very low, but still substantially higher than in most Western countries. And certainly high enough that it's not worth the risk.
I don't have an issue with border controls being a thing. I'm not a free travel idealist. I get why border controls exist, I think the premise of not letting people in unless they provably meet the host country's requirement is perfectly reasonable, and I certainly think that, even if someone did nothing wrong and just doesn't have their documentation in order, sending them back home on the first flight is an entirely reasonable thing to do. I just think that, in the current political climate, both the chances of being the victim of good old abuse and the chances of well-meaning ICE personnel screwing up are too high to be worth crossing the Atlantic for.
I do not think most people can conceive just how common and deranged the situation is, and that not only that the documentation is so poor and that most of the people this happens to will not speak up, either because no one will believe them or because they are not a citizen and are afraid it will result in reprisal.
https://www.nytimes.com/2025/04/04/us/chinese-woman-detained...
That's because in most publicized cases it turns out there is something more to it.
None of that happens at the border.
At this stage it doesn't even matter whether you have broken any U.S. law or not.
I would certainly no longer do US travel for a conference on a tourist visa in case that's deemed "work". (pop quiz to Americans: what visa do I need for that situation, and how difficult is it to get?)