Having a geopolitical adversary strategically hack political parties in order to change the outcome of an election to suit their interests is a HUGE problem. By selectively disclosing information a hostile nation can change the political landscape in the target nation to weaken alliances, change security posture, change positions on treaties, and/or create general dysfunction.
This is not a case where the public is getting information about everyone, it's a case where an adversary is attempting to illegally manipulate public opinion to our detriment. The goal and the result is not the public making the most informed decision, it's the public making a decision based on incomplete information specifically disseminated to help a foreign agenda.
This can only be described as an attack on our democracy.