Actually black protestors have used guns for protests before.
case in point, Olympia, Washington in 1968
View attachment 67199353
No one was arrested or shot. In fact the panthers were protesting a bill to ban open carry of firearms by openly carrying guns and the bill didn't pass!
Back in the 1990s White suspects were involved in some notable standoffs with federal authorities, two of them related in fatalities, since then the Feds have had a policy of waiting people out and using seige instea of direct confrontation.
In this case the protestors were occupying a building in a rural area and not disrupting any major government functions, time was a luxury the government had. it doesn't matter who the group is, had these protestors been black the response would've been the same.