Note that enforcing the law was crucial to Rosa Parks achieving her aims. Had the officer said "it's a stupid law and I won't enforce it", it would have foiled

Note that enforcing the law was crucial to Rosa Parks achieving her aims. Had the officer said "it's a stupid law and I won't enforce it", it would have foiled the test case that was planned with the aim of overthrowing the law. She's a poor example of your point.