Do not confuse people doing bad things with the MAGA Patriots though. I don't know a single Patriot who would condone militias, armed or not, threatening any law abiding people, let along FEMA volunteers. The world has its share of crazies who hold a wide variety of erroneous beliefs and concepts and who do evil. They exist on the left and right.
But if the news account is correct, and I have no reason to believe it is not, I would hope the authorities would be able to apprehend and neutralize the crazies as there is nothing to commend or justify their behavior.