If you're really interested in knowing I can tell you precisely why.
1...Because he is not afraid to say what everyone actually believes. He's not afraid of being called a racist or a misogynist or a fascist. When the President of the United States says that the way to hit back at ISIS after the Paris attack is to fight global warming ( http://thehill.com/policy/energy-environment/261193-obama-climate-conference-is-powerful-rebuke-to-terrorists ) you know all you need to know about why people are tired of politically correct lies.
It's politicians and corporations telling a population without enough jobs that uncontrolled immigration is good for them.
It's telling a country that's been recently exposed to Islamic terror attacks that the best way to solve the problem is to import tens of thousands of people from Syria.
2... People are stupid but they're not that stupid.
1. Think Brexit: The "leavers" spun a web of lies to which they admitted almost immediately after the result was announced; many of those fibs concerned finance and the holy cow of public health (which I also depend upon - across two countries); political correctness has already cast ugly shadows and fettered minds across the western world leading to public frustration when the reality of the obvious is clearly denied and rendered a no-go area for debate. The awake find it increasingly difficult to cope with the zombies.
2. I disagree. You can never overestimate the stupidity of the general public. Brexit proved that too, where multi-nationals were somehow conflated with non-existing jobs for the unemployable, foreign workers living in Britain and making a go of it held responsible for the same unemployable Brits; the existing (since the 40s at least) Asian and Caribbean communities in Britain imagined to be part of some imminent new wave of Turks swimming across the English Channel.
That the UK was slowly (due to the present Conservative and previous coalition governments) digging its way out of national debt was, by the Opposition, held up as 'austerity' which is supposedly evil incarnate. Why it's thought cool for families to stay solvent, not spend what they don't have, and thus try to stay out of debt, but magically wrong for
countries to do the same is just another manifestation of public nonsense designed to encourage the freeloaders to hold out for yet more.
We live in a world where expectations outrun paid-for reality.
I don't imagine the United States to have any greater a percentage of brilliant minds than does Britain. The only difference is that very few of our nutters have guns.
Rob C