Not sure if this question is better for martial arts or what. The goal is personal safety, but I find it interpersonal because it's a matter of maintaining personal safety using 'soft' strategies (decisions & discussion not body armor) while also maintaining group relations and norms and not burning any bridges or coming off as acting rashly.
In the news we hear about crazed acts of violence against innocent people. I'm not sure if this is actually any more common nowadays than in the past and I recognize it is an exceptional, unusual thing in any case. Still, it happens. In schools, in public places, in offices, maniacs lash out violently. I'm on board with "we can't live in fear" mentality, but I also think the world can be a dangerous place in general and one has to take some level of responsibility for their own safety in response to stimuli and circumstance.
Consider the following example:
In a class or school, a member of the group (student or employee) has demonstrated a history of (non-violent) aggressiveness. For example, when confronted about performance issues, they become enraged, turn red and yell. Those outbursts are dealt with by administrators but are not always grounds to permanently remove the aggressive member of the group. Eventually after so many outbursts and continued poor performance, the aggressive person is told their time with the group is up and they'll have to leave at a certain date. That person becomes enraged again, but cools off and remains until their expulsion date. (Why they're not escorted out immediately is an administrative decision out of group members' control.)
If I am one of the people this aggressive person has targeted their anger at in the past, I'd feel unsafe, concerned they could escalate to actual violence on account of their dismissal. Even before dismissal, this kind of person is a threatening presence for the group, especially for those they aim their anger at. How are group members to act in this situation?
For one to avoid the group - a class or work setting - may be acceptable for short periods as if one were sick, but that ultimately becomes a significant career move if one decides to just leave the group over this. To avoid the aggressive person like the plague is frowned upon as not everyone can take that course and it can escalate or upset the person, who's aggression and behavior may be improved by acceptance rather than becoming an outcast. To report the aggressive person to a higher authority doesn't seem to make sense as they haven't actually committed any crime or even threatened to, they are just generally short-tempered, and escalating the situation in that way may just escalate their bad temper or aggressive behavior in the future. None of us are perfect and being short-tempered is not a crime, though it can be threatening to the group. The situation becomes more complicated if the aggressive person is a known hunter or otherwise firearms enthusiast legally; a short-temper is not (yet) grounds to lose one's right to bear arms, and the aggressive person may have no criminal record or any history of physical violence toward other people. Heck, there are cases where this aggressive character is generally not seen as a bad person or an extremist in any way, quite friendly most of the time and appreciating life as most others do, but just has a temper and a bad habit of lashing out at others which is threatening to the group. In some cases, this aggressive person may remain in the group and not get expelled from it by administrators, and group members go on in their work while feeling threatened by this person's potential to become violent.
In these cases what is one to do? This is a situation I've recognized more than once over the years, in different settings and groups. I'm asking as if I'm a peer of the aggressive person. E.g. we're both students, we're both co-workers, and whether or not there is some hierarchy (e.g. project lead vs. project implementation staff), neither of us have sufficient administrative powers to remove the other from the group. Again the goal is ultimately personal safety, but achieved in such a way as to maintain group relations and avoid causing any unnecessary social or career harm. For example answers that suggest a group member outcast themselves are not really achieving the goal; while maybe an answer is simply remove yourself from the group, this is not always an easy option and is not a scalable approach that fellow group members can work with.