Shorter version of my last post
The possibility that Person A is a victim of unjust treatment by Person B does not negate the possibility that Person A may have unintentionally given Person C reason to complain. Defenders of Person A should carry on wholeheartedly, but should not do so by silencing Person C or denying Person C’s existence.
As a corollary:
Whether Person C actually exists or is an invention of Person B, Person A should take seriously the idea that such a person and the harm done them is feasible.