I agree with Matthew Franck's reasoning as he explains how he will vote:
For my part, my conscience is more important to me than the outcome of this presidential election. I cannot in good conscience vote for either Clinton or Trump. What matters for me is that I cannot bring myself to intend, to will the victory of either of these ludicrously unacceptable presidential candidates. And that is what a vote for one of them would be—an act of willing that Clinton or Trump be president, carry out her or his stated policy aims, and bring his or her fundamentally bad character to the highest office in the land.
.... “Not making the perfect the enemy of the good” is not the right adage for calculating what to do in our present predicament. Nor is “choose the lesser of two evils” the right way to think. That way of thinking really only works when at least one of the choices is in fact not really evil.
.... I do believe we have entered a realm of absolutes here, where trimmers’ calculations have no purchase on our decision-making. If “lesser evil” and “objective consequences” are not my guides, it is because the times demand that I reject both Trump and Clinton, declining to stain my conscience with a vote for either one of them.
After a lifetime of studying politics, I have finally, thanks to the electoral annus horribilis of 2016, arrived at an ethic of voting that I can defend against all rival ethics. It is simply this: Vote as if your ballot determines nothing whatsoever—except the shape of your own character. Vote as if the public consequences of your action weigh nothing next to the private consequences. The country will go whither it will go, when all the votes are counted. What should matter the most to you is whither you will go, on and after this November’s election day.