Yes there are restrictions. But student visa holders rights to free speech and due process aren’t among those restrictions. Can a student visa holder provide material support to a designated terrorist organization? Not under current US law. But they have the right to legal due process. If you believe in freedom and are concerned about a government taking away your freedom then you should be concerned about other people’s freedom as well. Especially if happens without any way to appeal to the legal system. These students deserve the right to defend themselves before the law.

if the govt doesn't respect 2A for these people, why would it respect 1A restrictions on its actions against them?

I am not concerned about lack of freedom of speech of non citizens. We cannot have a nation if we allow non citizens to come in, protest, and try to destroy the country that they aren't citizens or a part of. Just as I don't have this right in other places, they shouldn't here. The supreme court is wrong about rights of non citizens for a hundred years now. Would love to see a constitutional amendment calling this out we also need to go back to land owners being the only ones able to vote. Let's do that one while we are at it.