It is because of their backward thinking and actions that does not allow them to grow and flourish. They maybe dressed like monks, but what determines if they are true members of the Sangha or not would depend if they are able to keep to their vows, practice what they preach, and having the compassionate heart towards all sentient beings including Shugden practitioners.
But if they are not able to just follow things like that, twisting what the Dalai Lama had said to fit their extreme thinking, then it is just their negative karma that has caught up to them, not allowing them to know better on what to do.