Wikileaks is NOT Russian, nor is it Trump or RNC. They are a rouge sometimes white hat group, sometimes black hat group that just like to take down power structures for various reasons. Sometimes to better society, most times to settle old scores or put any perceived threats on the defensive.
My guess is that Julian Assange has declared war on the British/European/American rulers who have kept him imprisoned in that basement for the past four years. He is likely thinking if he takes out Hillary the Brit Government will crap a brick wondering what he’s got on them and let him go.