How a person reacts to being asked about the version of these things most close to them is telling. If they get defensive and deny the event happened, I would hesitate to trust their opinion on other things. Clearly that person bases their opinions on what they want to be true rather than reality. That's the kind of person whose ideology would likely lead to another event to be ashamed of. If, on the other hand, they admit it was a horrible thing and agree that people should be educated on it and that steps should be taken to prevent it from ever happening again, then I'm more likely to take their opinion seriously and believe that they can be part of the conversations we need to happen to create a better world.