A car horn is an emergency device, and a tricky one to use properly. It’s not something you should be using unless there’s a genuine safety issue. The horn basically tries to blow up the situation in the hope that the pieces will settle into a better configuration than what you have. It can easily startle somebody into doing the opposite of the right thing, or failing to recover from something they otherwise would have recovered from.
The only message a horn can send is “pay attention”. It can’t say to what, and in any situation where it’s actually likely to get used, there are probably going to be a lot of candidates. Not only that, but it draws instinctive attention to itself, and thus away from the real issue. You don’t keep honking, or even start honking, at somebody whose trunk is open. They’ll never figure it out.
It’s also annoying and disturbing to everybody around. Everywhere in a big city is dense enough that you’re going to disturb a lot of people if you get on that horn. Your having to wait at a light isn’t a sufficient excuse for that.
Blowing through red lights, or driving the wrong way on ramps, or the like, are, of course, serious safety issues worthy of being honked at, and the sort of thing where you have some chance the target will get the right message. However, the right answer for somebody who finds themselves creating such serious issues three times in a one hour trip is to get off the road and miss the birthday party. Then you actually learn what you’re doing before you get yourself into that kind of situation again.
Driving up an exit ramp should cause a total freakout in every fiber of your being, no matter how flustered you are. If it doesn’t, you’re not adequately trained and shouldn’t be there. Neither should a person who chooses to drive while flustered to the point of losing their skills. Arguably neither should a person who routinely loses track of when it’s their turn to go at a light.
They’re relying on a legal authority that only allows them to restrict non-Americans. Since Anthropic can’t tell the difference anyway, the actual effect has been to shut down everybody, at least for now.
Unusually for this administration, I think they probably actually do have legal authority to do this… assuming it’s up to date to cover cloud services. I’m not sure I think they should have that authority, but there it is.