It is very possible that the alleged interference from Russia resulted in Trump receiving fewer votes than he would have otherwise received, so it may have actually helped Hillary. If the information damaging to Hillary was coming from Assange, without any help from Russia (Assange claims that his information came from inside leaks), then Trump was being harmed by accusations of Russian help, without actually receiving any help from Russia, thus probably costing him the loss of some votes.
Good point.