Good. I’d hoped this would happen. He’s not going to the USA for any reason for the foreseeable, because he’s going to have to declare the visa denial, which in itself probably means he wouldn’t be eligible for ESTA.
As a previous holder of a US visa that allowed me to work there, I can say that in my opinion that the USA is actually one of the hardest countries in the world to (legally) emigrate to, and they’re very fussy indeed about who they let in. You don’t need a criminal conviction, just an arrest is enough for them to think twice.
And even as a visa holder, I had no right to expect to be admitted every time I flew out, the border officer had the last (and final) say each time. I still received the occasional grilling about why I had my visa and what I did and why should the officer let me in that day.