Manipulative people will always use whatever is the popular/dominant ideology of their time and location to get any sort of benefit they can. It might be manifested as being the most fervent communist, fascist, pious/religious, or whatever it is the the society at the time holds high and dear. In our times it just happens to be victimhood and social justice things.
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.
I feel like the constant bickering over who should be included on the flag distracts from the real problems.