Each election there are three choices and the winner is always not voting. In 2016 100 million people chose this option, far far more than people who voted for Trump. Or Clinton. “None of the above” effectively wins every presidential election, and it isn’t even close.
For many Americans, as they see it, politics, especially presidential politics, doesn’t matter. It’s a far removed thing that every few years makes a lot of noise, pestering them with ads and phone calls, and when over, forgets about them or screws them over. It is like that flower they see on TV that attracts big crowds because it blooms every seven years and smells of rotting flesh.