I think there are people drawn to the absolutes. I can maybe see how it can be comforting to have a black and white issue to try to solve / help. A good side to be a part of in a world that to some seems very bad or confusing.
Some old friends of mine are very much into these kinds of children’s issues. But when they talk to you about it it’s all emotion, it’s not even clear to me that they know much at all other than a sense that the bad guys are out there, maybe some strange legislation they support and so on. They’re not interested in justice, just this absolute sorta cause.