Sure, but with societal unrest don't you think there is a limit on how many foreigners you want in the country to be tilting the scales?

No. Freedom of expression is a human right, not a privilege of citizenship.

And he can continue to express himself, or can't he?

Sure, just like an American snatched off the street and sent to prison can still express himself in prison.

He is in nowhere like prison.

So? Your logic applies to prison just the same, obviously.

Being in prison and being free in your home country sound pretty different to me, in terms of free speech, or free anything really.

They're no different on the dimension that you identified as relevant: is he able to express himself or not?

I mean, you could put someone in solitary confinement and he'd be "able to express himself."

It's almost as if your heuristic is a bad one, which is why it is not the one established in the US Constitution or 250 years of case law.

If you don't think there is a difference in being free and being in jail, then yeah, I guess we won't find much common ground.