Are there any countries that guarantee entry to every person unless a court denies that person entry? Is that a standard that any country adheres to?
Turning a whole group of foreign students back at the border is very unusual, and it's unclear why the government wants to increase legal insecurity and broadcast that it can't be trusted.
Issuance of a visa does not guarantee entry to the United States. A visa simply indicates that a U.S. consular officer at an American embassy or consulate has reviewed the application and that officer has determined that the individual is eligible to enter the country for a specific purpose. The CBP Officer at the port-of-entry will conduct an inspection to determine if the individual is eligible for admission under U.S. immigration law.
https://www.cbp.gov/travel/international-visitors/visa-waive...