I don’t follow? It could be that your counterexamples include the necessary condition, but don’t have the sufficient conditions.
In the abstract, if conditions A, B, and C are stated as required to achieve a desired outcome, the fact there happen to be examples of undesirable outcomes with condition A (but implicitly lacking conditions B and/or C) is not enough to prove that condition A is NOT a necessary condition for a desired outcome.
In the abstract, if conditions A, B, and C are stated as required to achieve a desired outcome, the fact there happen to be examples of undesirable outcomes with condition A (but implicitly lacking conditions B and/or C) is not enough to prove that condition A is NOT a necessary condition for a desired outcome.