Unless the unruly bear is these security researchers, the fleeing campers are other security researchers in the same field, and their fleeing is them correctly assessing that some LEA is going to be taking down any bears nearby that even twitch wrong after this.
Bad actors ruin it for everyone.
You seem to think that because the police are theoretically under democratic oversight, that one can safely interact with cops as though the nominal rules of engagement will restrict them, but even if - in the long run - it is possible to rein them in, the law enforcement system we actually have right now is unpredictable, unjust, and unsafe.
If you distrust the police to the degree that you think even if your actions weren't illegal you will still have negative consequences from interacting with them, definitely don't do the above.
When someone's actions extend to endangering the public to the degree we see here (which I think is obvious once you've watched the video), they are past any good will I would have extended them in not contacting the police for fear of an overreaction. Their clear disregard for public safety is reason enough for me.
Additionally, on the chance that it was entirely intentional and they are counting on the media and possibly even law enforcement response to help make this an issue, they they definitely don't need our restraint, and nor do they want it.
It does not matter that we theoretically have democratic oversight. In practice, what we have is a system where cops can do whatever they think fit and expect to get away with it. They are armed and dangerous; it is not safe to interact with them. It is not a good idea to call them, or to talk with them if someone else calls them, because they - the cops - have a clear disregard for public safety when it is counter to their own interests.
If I was robbed, I would call the police. If I saw someone waving a gun around in public, I would call the police. If I saw someone using a car as a weapon, I would call the police. If I see a situation where people are endangering the public and someone might get hurt, I would call the police. Not doing so when I clearly knew I should would make me feel somewhat responsible for any negative outcomes otherwise.
I'm not really interesting in continuing a discussion where the other side's position seems to be "the police are racist scumbags and they will ruin your life with the slightest contact, so don't call them on criminals." You might find that characterization unfair, but then again, you're the one over-generalizing using large media events as evidence instead statistics.
Edit: Removed reference to ad-hominem, which wasn't factually correct.
While I agree with much of the rest of what you right in that comment, this is not accurate: overgeneralizing a negative stereotype of someone other than the other party in a debate isn't "pulling an ad hominem".
And tossing chocolate bars into your neighbor's campsite in hopes that the angry bear will wreck their stuff is just not cool.