It's funny what you say, because he never was selecting between what to leak or not. He's only got leaks and published those no matter what. So you're accusing the anonymous leaker rather than Julian, to help Trump win, that leaker whose identity we still don't know of, because Julian Assange was only a safe middleman for them. And looks like he fairly well did his job.
This is one of the points, why we think it is unaccaptable to have him tortured to death.