This is why we are not travailing the US right now.

Because you think ICE will arrest you for being an illegal immigrant? If you seriously believe this, then probably its best you don't go outside anymore.

Every time the media reported something like this, turned out they were leaving out something important. Like the professor who was smuggling biological samples into the US. Turns out that's illegal, that's why she went home. If you aren't doing something like that, you will be fine.

As someone who has travelled a fair bit across the border between Canada and US, CBP agents have always tended to be dicks drunk on their power. I've seen plenty of blatant abuse at the border. So really the only thing that needs to happen for CBP to ruin your day is for an agent to have a bad day for their own. The only difference between then and now is that they're given more tools to do so and actively encouraged to use them.

Yeah these people that think there is any measurable risk to going to the US as a normal tourist or businessman respecting US laws while there really need to get out of whatever bubble is feeding them that fear.

This is also why a lot of people refuse to travel to the UK now.

That's reasonable.

This is one of those technically true but defacto false things. Its legal under UK law, but if they want the variety of benefits they get from the US then it isn't. If the UK government starts arresting vacationing Americans for things that aren't a violation of US law, its all a matter of if the US governments wants to make an issue of it. Maybe you get lucky and nothing happens, or maybe you lose your military protection and 25% of your GDP. Plus your tourism businesses take a hit. You really want to take that risk?

But given the behavior of the UK government lately, doing something suicidally stupid seems on brand for them.