“They might not release eMails that would harm Hillary if they calculate that she would be an easier foe as president than Trump.”
They might rather work with competent people.
The Obama/Clinton policy in the Middle-East has been a disaster. I doubt they want to see more of it and may prefer Trump or Sanders.
Can you imagine headache of PIAPS trying to impose sanctions on Russia for gender specific bathrooms?
Don’t you think the Russians might have a higher priority than Climate Change?
They might find it useful to publicize how much the PRC knows about US secrets.
The last thing the Russians want is an unstable world.
There are several good, non-nefarious reasons that they might release the Emails.
Or, as others have pointed out, with the eMails Putin could blackmail a president Hillary much as he seems to be able to do with Barack.