Oh, if it isn't the consequences of one's actions catching up to them. All of those students and professors who ruined the Spring and Summer semesters of college for Jewish students and their allies are starting to face their punishment. Oh, well. 

He's very upset he wasn't allowed to come to a country to study and then make other students miserable.

It's pretty cut and dry, actually.

Sometimes, no matter how gracious a host, their guests do not return their kindness and generosity of spirit. When that happens, the host is right to ask the visitor to be on their way.

He should have read the rules a bit more closely.

Exactly! One would think this is the last place he would want to be.

That's an easy solution.

The quicker the better.

Good luck in all of your future travels.