My honest answer begins with extreme disgust. When I look at voters, I see human beings at their hysterical, innumerate worst. When I look at politicians, I see mendacious, callous bullies. Yes, some hysterical, innumerate people are more hysterical and innumerate than others. Yes, some mendacious, callous bullies are more mendacious, callous, and bully-like than others. But even a bare hint of any of these traits appalls me. When someone gloats, "Politifact says Trump is pants-on-fire lying 18% of the time, versus just 2% for Hillary," I don't want to cheer Hillary. I want to retreat into my Bubble, where people dutifully speak the truth or stay silent.
Indeed, if, like von Stauffenberg, I had a 50/50 shot of saving millions of innocent lives by putting my own in grave danger, I'd consider it. But I refuse to traumatize myself for a one-in-a-million chance of moderately improving the quality of American governance. And one-in-a-million chance is grossly optimistic.