You can point to just about anything and find aspects that contain some degree of abuse. This applies to religion, politics, business, psychology, family and probably a lot more.
What makes any of these abusive is not that they sometimes abuse people but rather abuse of power is a fundamental aspect of their teachings and behavior. In the many different scales used to define abuse, groups that are totalitarian usually score positive on almost every point in the variouslists.
Non-abusive groups may score on 1 or 2 points. But those points do not demonstrate a pattern of abuse.
Another aspect may be that some members of a group may take things to the max, which may not be an actual belief of the group.