The hacking and stealing of private email correspondence can not be justified. The only thing that would have halfway justified the hack and leak is if there was illegal behavior exposed, and only the relevant emails were released. What the Russians and WikiLeaks did was tantamount to the crimes committed in the Watergate scandal which cost Nixon the presidency.
Every campaign and organization is going to have dirty laundry that would be damaging if exposed, but nothing in the emails suggests illegal behavior. As much as you may dislike the DNC and HRC, it’s quite disheartening to know that voices on the left feel that the illegal and morally abhorrent act of this hack is somehow a good thing.