According to our intelligence acencies the hacks were Russian. So, either our intelligence agencies are wrong or assange is lying. I personally have no evidence Assange is lying but sounds like our intelligence agencies do. Of course this doesn't mean there was collusion, but it does mean America should be investigating how, what and with whose knowledge/assistance the electoral process was influenced.
To say we should investigate Rich the same is silly. Investigate the hacks and information dissemination. If that leads us to Rich then unravel that thread. But so far as much as I can tell, that's not the case, but there have been many ties between people in trumps campaign/Whitehorse with Putins men, and some red flags attached to those connections.
But, nice try.