Criticism is a necessary part of the survival of societies.
Those societies which treat criticism as a crime punishable by isolation and destruction cannot grow, thus will not survive the rigors and challenges presented by the planet. It’s like growing up in a world without caretakers to teach and guide.
Groups insisting on taking care of their own, while telling everybody else to mind their own business or they’ll make their lives a living hell, aren’t exercising survival instincts, they’re withdrawing inward to the exclusion of everybody else, which are the early signs of extinction.
The downside to killing off or stifling all those who dare to criticize the practices of a group, is that when an alarm should be sounded to save the group, that alarm will remain silent as a result of past fears of retribution by that group.
Accepting criticism only from like-minded individuals or those contained in the group is prejudicial and self-discriminatory. A willingness to change with new information and a willingness to revisit the utility of old ways is necessary for the survival of any group.