Your example might sound ridiculuous, but this is actually happening all the time. People might not literally jump off a roof, but they do blow themselves up with bombs, go on killing sprees or commit suicide because someone told them so.
Sure, but saying that every religious teacher is fine would be equally wrong. We have a sense that charismatic figures have a corresponding responsibility to their followers (even if they never asked for those followers!) and that broader society should be concerned about what's going on at religious gatherings, especially novel ones, that there's a real risk they can shade into dangerous cults.