Americans have been convinced to vote against their own best interests by decades of lobbying and propaganda.
As just one example, they deeply believe Socialism is evil, never mind the very vast majority of their daily services are dependant on it.
Here on HN I often read that there are a lot of problems with healthcare, poverty, minimum wages, too big cars, overweight, pollution, racism, big companies and rich people having too much power...
... and then i see the result of the election and the only argument is: this guy will fix our too high taxes.