[Karellen]

Just because a bunch of dark triad types have a propensity for lying about having been victimised, does not mean that most people who say they've been victimised are dark triad types lying about it.

Yes, you should keep in the back of your mind that it's possible that someone who claims to be victimised might not be telling the truth, but your first instinct should be a presumption that they're telling the truth, and to act with compassion as if they are. Especially if you're not familiar with the ways in which they claim to have been victimised - your instincts about how you think that plays out might not be great if you've not actually been through it yourself.