The fact that Johnson had zero probability of winning was reason to not vote Johnson.
I've never understood that line of thought. If you are a Russian should you then feel obligated to vote for Putin, because he is going to win? For Kim Jong if you are a North Korean?
Is it some hope that one time you will vote, and the race will come down to one vote - thus giving you that lotto-winning feeling that you single-handedly altered the course of history?
If someone actually supports Hillary Trumpkin, that's one thing. But if you don't, but vote for them anyway because "they are going to win" then I honestly find that extremely sad.