maybe this will explain better
If I told you there was a molestor (Assuming I had proof) around and I am going to tell everyone to keep their kids away from him , and you said to me Its averiah of LH to do so. I would say I dont care about this averiah, people need to know this person is a Rasha and a threat and keep your kids away from him. And if you want to say Such and Such a Rav, says its an Averiah to tell people, I would tell you, that rav is wrong and you need to get another Rabbi.