It is my opinion that the only reason Liberals care about Russian interference is because it's a lever with which to break Trump. If it can't be used to bring down the evil orange overlord, I believe that liberals in general will lose interest. Unless it can be used to demonstrate the lack of ethics and loyalty of conservatives, it's of no import to them. Conservatives only care about Russia because it's being used as a lever against Trump. If there is no direct link found between Russian interference and Trump, I believe conservatives will lose interest. Unless it can be used to demonstrate that liberals are involved in a witch hunt, it's of no import to them.
So basically, in my opinion, the only reason that *most* people care about Russian interference is because of either a deep-seated and irrational reverence of Trump, or a deep-seated and rabid hatred of Trump. Very few people actually seem to care about the actions of Russia on its own merits and as a separate issue.