Kaballah is and always has been controversial, but now that it is more "mainstream" and popularized, the opportunity has been created for charlatans to step in and hijack it and distort it and teach it improperly when they have no idea what they are really talking about, and they teach it also to people who have no business learning it. And charlatans of the highest order have certainly stepped in. That is why you hear stories about Madonna "learning" "kaballah" - a disgrace.