It's complicated, and some voters aren't even in the same world as you are any longer. For some people this is no longer Democrats vs. Republicans, but establishment vs. anti-establishment. We are at the point that many people both on the left and right feel that voting for the candidate that represents them less is a strategy worth considering out of fear that their own nominee is giving their party cancer.
This election has been so foul that there isn't really a "lesser" evil any longer. The whole "lesser evil" paradigm has been pushed to such an extreme that it's just Evil vs. Evil now and we are looking at a lose-lose situation. During the recent debate did either candidate talk about Citizens United? Which of the major candidates will mean less war, or even if you like war, smarter war? One is a threatening, blood-soaked Secretary of State that never changes and never learns, and the other is a hot head with a fragile ego. Many of the things you fear from Trump, Clinton has already actually done or at least pushed for.
They have both handled their campaigning in perplexingly abrasive ways. While I don't need to waste any time on Trump's "mistakes" because MSM will jackhammer them into the heads of anyone who dares to listen, consider Hillary's. After that controversial primary election that left Sanders' supporters feeling shafted, Hillary did very little to bring them on board, and many of them are young people voting or first time voters, getting this kind of sour experience with the Democratic Party. On the contrary, the convention did everything they could to silence the Sanders wing, and Hillary instead sought to cozy up to Republican donors. While you'd think this is part of that deceitful "triangulation" strategy that her husband made popular, she then went on to call Republican voters a "basket of deplorables." Does she think that her donors alone will get her enough votes?
I suggest that if anyone who doesn't live in a battleground state wants to vote third party, do so. Johnson is on the verge of meeting that arbitrary debate entry percentage, and Stein, who is on the ballot (or can be written in) in all states except Nevada, Oklahoma, and South Dakota, should be qualifying for federal funding at 5%. The electoral college will deliver your state to one of the top dogs even if you convince everyone you know to vote third party. If you do live in a swing state however, well congratulations on holding the power to decide which evil we wind up with.