There is a distinction between what is legal to do and what is socially acceptable to do. While black mail over illegal actions are the most common example use

There is a distinction between what is legal to do and what is socially acceptable to do. While black mail over illegal actions are the most common example used, a society that is very liberty focused in the law but who has strict standards on what is considered acceptable behavior can still lead to blackmail. A society would need to be both liberty focused and tolerance focused to reduce the potential for someone to be blackmailed, but this runs counter to the notion that the fallout of blackmailable material being released is a just occurrence. Blackmail is a side effect of punishment, legal, social, or otherwise, and the only cases where I think the majority will agree to reduce punishment to reduce blackmail is cases where people already believe the punishment isn't deserved.