This article is important. It goes a long way to establishing how counterfactual it is to think Hillary lost due to the Stein candidacy. Even if Stein had dropped out, the net number of voters then going to Clinton would not have changed the outcome of the election.
What I wish to add is that even if it would have hypothetically changed the outcome, that in no way diminishes Hillary’s responsibility for her loss. The Stein candidacy was not a secret. So why does Hillary get a pass for not mounting a campaign effective enough to overcome the challenge posed by Stein or otherwise finding ways to get so many other votes that the pittance going to Stein would be irrelevant? Hillary and her inept campaign staff are entirely to blame. They failed to acknowledge was that she was in danger of losing these Midwestern states, that her vaunted Blue Wall was constructed of fawning media hot air. If she would have gone to Wisconsin, if she would have made a few more stops in Michigan or western Pennsylvania, it might have made a difference.