Mark — I wholeheartedly agree with you that Trump is a terrible choice for president. However, I wholeheartedly disagree with you that Hillary Clinton is a viable alternative. I will refrain from stating why; her flaws and transgressions are well known.
I read the article by Clay Shirky you posted and have to say, anyone who states that voting for someone only 9% of Americans voted for is a wasted vote, is misled and ignorant to how the US Electoral System works. You must win 270 electoral college votes in order to become the next president of the US. However, if no one wins 270, it is the House of Representatives that chooses the next president from the 3 presidential candidates that receive the most electoral votes. This is mathematically possible even without a third party candidate. Johnson conceivably could win just one state where he tends to poll strongly (New Mexico, Colorado, etc) or just one congressional district in Nebraska or Maine and he would be eligible. Not to say it’s not low probability, but totally and completely possible. And I even think it’s more conceivable that a Republican HoR would choose a Johnson over a Trump and certainly over a Clinton any day.
If you think HRC is the best choice for president, by all means vote for her (we can continue that conversation if so). But you cannot say that a vote for a candidate other than Trump or Clinton is a wasted vote. In fact, it’s thoughts like that which are precisely why we are stuck with the two most hated candidates in American history, a damned if we do, damned if we don’t choice. You in particular, I believe would be drawn to Johnson’s platform and what he stands for. And if more people rallied around that idea, of an alternative choice, we could avoid an angry, divided outcome, which will inevitably result if HRC or Trump wins.