I also think that a lot of people tend to "go along with it" to prevent being thrown out of their current group as well. If they extend compassion to someone who is struggling they might make a new friend and not need their old peer group as much, or they might find that the person is genuinely difficult to get along with, even if you feel empathy and compassion for them, and end up rejected by their former peer group as well, a lose-lose situation that is not worth the risk.