@kegill That's true, but, it misses the point.
The other side is arguing that the guy is not at all being arrested for peaceful protesting. They would agree with you, and say he can protest peacefully all day, but that's not what they say he did.
So to point out that peaceful protest is protected speaks past the charges against the guy, which according to them have absolutely nothing to do with peaceful protesting.
So no, according to their argument, it is completely wrong that they can arrest anybody. That's a straw man argument compared to what the other side is actually charging.
@volkris
Peaceful protest IS constitutionally protected. Court precedent says that applies the people in the country legally. He’s married to a US citizen and has a green card.
If they can arrest him, they can arrest anyone.