I have flimsy answers to the situations described above. I should note that I have good reasons for believing what was described, and that's only my perspective.
I consider detachment and selfishness to be the two solutions, and they kind of suggest that victims behave in two conflicting ways. But they should, depending on the situation.
If one is detached from many of their passions, one can see that others have no choice but to behave as they do, and in most cases, the subject (the victim) must continue to act the way he acts regardless. In this way, it might be easier to have faith in reality. If detachment is taken too far, there could be problems. It could lead to paranoid schizophrenia, by which I don't mean seeing too much, but caring too much that things aren't quite right. Too much is relevant. Then the answer might be to leave it to a higher power, and carry on having faith, and to remember to prioritize. Most people ain't nothing, and victims should generally have more respect for themselves. There is nothing to defend (unless it becomes critical to do so).
The other is selfishness. In an existential crisis, when all (but really some minority) are against you, the basic response is just to do what you want. This could be protective, or it could lead to a nasty character. It's not wrong in itself, but obviously shouldn't be taken too far. Instead, people should ultimately be interested in the truth and in contemplation, and avoid to the best of their ability anything that might drain their energy.