@Envisage
Please explain how, in the system you deem broken, one concludes that Trump is the lesser evil.
Consider yourself a person with relatively conservative views.
This might be hard but you'll have to try to understand the point.
Consider yourself largely leaning in the conservative direction in most major issues. You don't think gays should be allowed to marry, you think reducing cooperate tax is genuinely the right move for the economy and jobs. You believe that the US's religious heritage is important to preserve, you are anti abortion etc. Etc.
You don't even need to hold extreme views on this, just that you generally agree with those statements.
Now you have a system that forces you to choose between Hillary and Trump. Hillary is pretty much the antithesis of everything you believe in, and even though you feel Trump is incompetent, or will do a poor job at supporting his party, it is still in your view more likely to give an outcome closer to what you value than what Hillary will give.
That's a large percentage of Trump voter's positions.
Now if you had a system closer to for example Germany's, then you would have several candidates that will be represented in government. In Germany it's at least six parties. If Trump and Hillary ran in such a government then would be trump voter's would be far more likely to support a moderate candidate that closer represents their views and would not be forced to make a lesser of two evils choice.
While from your perspective Trump is the greater of two evils - someone with different values to you will "obviously" - in their view - disagree.