Hacker News Reader

There’s no such thing as a fixed amount of travel, and constraining it on one way concentrates it in another. That makes no sense. Constraining travel will reduce travel, which will reduce interactions between people, which will reduce the spread of the virus. We know this empirically from previous outbreaks and countermeasures.

The pressure / desire to travel is also dropping sharply, though.

Limiting all Schengen traffic is an extreme example, but it's not obvious that some level of restriction would necessarily produce a significant bottleneck effect (given that citizens are exempt).

Why would you assume total travel is constrained? Restricting travel from Europe to US will just eliminate that portion of travel, not concentrate it in the US.