Surely you’re aware of the US’ involvement in meddling with overseas elections via CIA intelligence campaigns, whether it be in South America, Southeast Asia, Poland, or elsewhere?
And the US are far from the only ones to have interfered with the governance of other countries through propaganda and strategic information leaks.
The specific mechanics here (hacking private communications and releasing them) might be different from what we have seen in the past, but the underlying goals are commonplace.
And off-topic, but why did you feel the need to be so insulting with your first sentence in your reply?
It doesn’t make your point any stronger.