I wish that everyone who complains about Donald Trump being president would STFU and start working on repealing the electoral college: especially if they are rabbiting on about Russia. Time would be much better spent working on reforming the US political system than trying to blame others for internal problems.
Anyway, the real suspects in how this mess happened are:
1) the electoral college
Seriously, I've posted enough material about how this doesn't do anything it is claimed to do and needs to go.
2) the Diebold Voting Machine
I don't know about the other two states that went for Trump, but I do know Pennsylvania uses the things. Lots of talk about how these things are dodgy and not verifiable. Yet more talk about Russians than that these things are still being used in US elections.
3) The Duopoly itself
Again, another thing I have been talking about a lot and won't go into again. Look at the previous posts.
4) The media
This is a seriously incestuous problem since even "lefty/liberal" and non-US source were demonstrating unreliability here. For example, The BBC was neglecting Bernie Sanders. Another example is that the Guardian spends a lot of time on the Russian BS. Not much really worth reading out there. But the news sources tend to be thing like AP. The Media built up Trump since he was good for ratings!
5) The Money in US Politics
Ever wonder how Bernie could out fund raise Hillary, yet Hillary gets the nomination? There's your answer: it's all documented in the Democratic Autopsy.
Anyway, that's the short list. There are a lot better suspects than the Russians out there for who to blame for the US's political problems. Things won't get any better as long as people aren't examining the system itself.