That’s an odd comparison for right after explaining how people of color get away with these same tactics, seeing as how your very article talks about firefights and how someone was killed. As @Shuck says, your comparison to Ferguson neglects some major differences too.
In any case, though, while I wouldn’t call AIM terrorists per se I think it is clear they were breaking the law. And although you touch on this, I’m seeing these comparisons used as false equivalences often enough that I’d like to spell it out: not all law-breaking is the same. You may excuse it to some extent when following the law is perpetuating mass injustice – and in this case, when treaties were already being broken – without excusing it when it’s a question of idiots feeling entitled to use up public spaces.
Yes, that would mean weighing trying to help people and trying to rip them off differently despite the resulting actions sometimes looking vaguely similar. No, I don’t care. Form is not content.
It would be really nice, though, if some of these people were charged for it. Not anything using “terrorism”, and certainly not by forcing an armed conflict. Just after the fact and using the ordinary laws they broke seizing a bird sanctuary and threatening people. Because it would be nice not to show militias this approach lets them get away with whatever they want.