Only because people cared not to look at the real reason that drove a majority of Trump voters to choose him over his contender:
Do You know how many gun owners there are in the U.S.? The so called “2nd Amendment People”? While there are no precise numbers in spite of gun registration laws, 200 million would sound about right. Do You know how many members the NRA alone has? Not every gun owner is member of the NRA, but every NRA member owns at least a dozen guns/rifles. Many hunters among them.
These people had very good reason to believe that the so called ‘Democrats’ are after their guns — to limit greatly who would be able to own firearms. They didn’t even talk about the consequences of leaving only ‘law’ enforcement armed and thus, like in Germany under Hitler, leaving the citizenry to bring a knife to the gun fights of a potential revolution.
While other reasons to vote for Trump made surely sense to many of his supporters, the number one factor was gun ownership and not racism, or economic considerations. Folks tend to believe the most ludicrous campaign slogans and the public relations (propaganda) team working for Trump played the Bernays card very well:
“Make America Great Again” — same shit different taste as:
“Change You Can Believe In”
“It’s The Economy, Stupid!”
These campaign slogans speak more about the true intentions of whom to lure into the respective ‘camp’. The principle of the ‘Pied Piper’ to which people seem to be extremely vulnerable.
Therefor the main reasons why Trump became president was gun ownership and not thinking things through.
But the sole reason why the Democrats lost lies in the fact that they ‘Wallace-ed’ Bernie Sanders.
That’s just my take on it and it makes the most sense to me.