And this is hard, for perhaps damaged but mostly psychologically normal people. You can see their pain, feel their loneliness. But they cannot be helped. Not in this life. Not if they cannot feel what they do to others at the level of a deep underground stream.
Unless you pay close attention, the act of stealing can be hidden from your conscious awareness for a long time. But some people will just make you feel tired, will suck the joy out of your life, make you feel weary. And while all this going on they may feel energized, good, enthusiastic, fun.
Narcissism is more or less equal to psychic vampirism. It is people who did not get enough love when they were tiny helpless little beings, crying for loving and getting none or—perhaps worse—too little.
Those of us who are sensitive can see all this. And there is nothing we can do, but watch, or be dragged down with them.
Cognitively I always try to choose optimism, but logically and experiential I know not everyone can be saved. Not by me, in any event, and not in this life.