Didn't Cap and Tony beat each other within an inch of their lives because of Tony's rage over his parents' murder?
Didn't Peter try to beat Norman Osborne to death out of rage over the murder of his Aunt May?
And besides this, every person has a different experience in life. Each of us has no idea whatsoever what demons any other person may be struggling with and cannot compare our experiences to theirs fairly. To do so is hubris, which is what Jen exemplifies in that scene.