There will always be people who abuse power, are petty, jealous and downright mean-spirited. You can't change people's character but you can give them something to think about, which you have. Pointing out people's obvious failings mostly doesn't work, I have found. They evolve if they have a life changing event. Until that happens, avoidance works best.
I totally agree with you . All you can do is offer people the truth and its up to them what they choose to do with it.