You will note that while the group gathered in Oregon is almost assuredly all or nearly all white, that has scarcely been mentioned in any story.Maybe because it's damned awkward to write "almost assuredly all or nearly all white." Isn't it a problem to just guess they must be white people?
You will note that nothing even close to similar can be said about coverage of events in Missouri, Maryland, Illinois or any other place where questions about policing have given way to protests or actual riots.Close to similar to what? When reporters were directly seeing activities, they were put in a different position, where they would have had to censor part of the facts they themselves witnessed. But more important, the people engaged in the activities were themselves calling attention to race and specifically wanted to be seen as black and they framed what they were protesting in terms of race. We were told "Black Lives Matter" and criticized if we tried to race-neutralize it with "All Lives Matter." These protesters were regarded by many as "principled and committed" — principled and committed about racial issues. The press presented them in the terms they used, so that was in fact very similar to the coverage of the Oregon occupiers.
And, by the way, it's pretty absurd to say "White Americans, their activities and ideas seem always to stem from a font of principled and committed individuals." I mean, I believe that it seems that way to some people, but it's my observation that white Americans are often portrayed as stupid, ignorant, greedy, and bigoted.