Like the most infamous con men in history, Donald Trump has spent his life making big promises that he never intends to keep.
His cries of
"Invest in my Atlantic City hotels and you'll get rich!"
or
"Invest in my Trump University and you can make money like I do!"
before he ran for President became
"Vote for me, and I'll give you better healthcare than Obamacare!"
and
"Vote for me, and I'll build a border wall that Mexico will pay for!"
while he was running for president.
Donald Trump's specialty his entire life has been to get people to believe that if they trusted in him, they would be better off. In 2016, he got tens of millions of people to believe that lie, and he was able to do that because he has spent his whole life getting good at grifting people. Donald Trump has one thing that he is truly good at--getting people to believe that he is not lying to their face. He is the little boy telling you that he did not steal a cookie when you can see the crumbs around his mouth.
Trump is great at creating the illusion of fake sincerity. People like him are really good at tricking people out of their money or getting women to climb into bed with them, but they are terrible at creating businesses that are successful in the long term, and they are terrible at creating loving marriages and families that work really well in the long run and that create decent people. Trump has always been about the quick buck and the quick grift, but in the long run, he will always let you down because he has no conscience. Trump has no guilt when he does not do what he promised, and when he does not deliver, he will lie about it to everyone, including himself.
Donald Trump is the very definition of unreliable. He is the last person you can depend on because he is lazy as hell, and his laziness does not bother him at all. This is why Donald Trump fit in so well with the Republican Party, because every Republican President from Nixon on has spent countless hours making promises of how great things will be once they have been elected, only to decide the moment that they are elected that the job of the Federal Government is to do as little as possible for regular working Americans.
This is why Republicans do not bother to put forward a realistic national healthcare plan of their own, and why no recent Republican President has ever improved the rights of organized labor in order to make sure that Americans get a decent wage. The specialty of modern Republican Presidents is to pretend that they care about working Americans before they get elected, and then to throw them under the bus after they get elected. This is Trump's way, and this is the Republican way.