When you have reached a point where the authority of the Nation is being resisted by force, the only response to fixing the issue is Force. More importantly, citizenship doesn't just give you rights, it also gives you duties. Chief among those duties is loyalty to the nation that you are a citizen of. If you are a naturalized citizen and are doing these things, you need to be De-Naturalized. If you have a green card it needs to be revoked, and if you have no right to be here at all you need to be made too leave.
A Nation cannot tolerate foreign peoples in its land waving the flags of their own countries on the soil of the host country. This adds a new character to the unrest that is intensely dangerous, because it says the lawful government that rules the land is the OTHER, and We, the Mexicans will fight the lawful government on behalf of our group, the Mexicans.
It is an implicit threat to the Americans, who are last I checked, the people who are in charge of that land. So yes, A House Divided Cannot Stand. If you are an American you either get with the program and help your countrymen get these invaders out of our country, or you are a part of the problem.
