So your saying that the crew of a warship that has just witnessed the obliteration of their homes and billions slaughtered is going to adopt a "forgive and forget" attitude and not become hell-bent on revenge against those responisble for this?
Maybe not, but they would probably be kinder toward each other than the BSG characters tended to be. They would probably be more able to overcome their personal soap operas and petty resentments toward their fellow refugees, since they would pale into relative insignificance. They would probably be less inclined to engage in internecine violence and capital punishment, because they'd be smart enough to recognize that their population size was dangerously low and only complete idiots would continue cavalierly killing each other off under those circumstances.
Sure, not all of them would be. There would certainly be those so scarred and traumatized, or so unable to face reality, that they'd sink to the worst extremes. But there would surely be others who overcame their petty divisions and banded together for the good of all, or who performed great acts of selflessness and sacrifice in service to others. In real-life disasters, you routinely see human beings going to both extremes, the worst and the best. BSG tended to dwell disproportionately on the worst.