But if the blackmail information is a good thing to publish, then blackmailing is still immoral, because it should be published and people should be incentivized to publish it, not to not publish it. We, as a society, should ensure that if, say, someone routinely engage in kidnapping children to harvest their organs, and someone knows this information, then she should be incentivized to send this information to the relevant authorities and not to keep this information to herself, for reasons that are I hope obvious.
But if the blackmail information is a good thing to publish, then blackmailing is still immoral, because it should be published and people should be incentivized to publish it, not to not publish it. We, as a society, should ensure that if, say, someone routinely engage in kidnapping children to harvest their organs, and someone knows this information, then she should be incentivized to send this information to the relevant authorities and not to keep this information to herself, for reasons that are I hope obvious.