I have no doubt that there are MANY Jews who find their behavior and actions utterly repulsive and not at all in keeping with the teachings of Judaism just as I have such feelings for some who profess to be Christian yet conduct themselves in decidedly un-Christian ways. It's unfortunate that they've chosen to wrap themselves in the visual trappings of Judaism and present such imagery as a primary part of their public image, perhaps in an effort to gain sympathy and support from Jews or from those who are simply impressed by such displays.
In Leviticus we are told that we are not to mutilate ourselves. Clearly it is beyond the child’s control but these are not very good Jews. Liberal Jews will be fine with this but not the more observant ones. I’m sure as hell not OK with it;It goes against the Torah and Judaism. I’m not perfect but there is a difference between imperfection and doing something willingly.