From David Roth in The Baffler last August:

The most significant thing to know about Donald Trump’s politics or process, his beliefs or his calculations, is that he is an asshole; the only salient factor in any decision he makes is that he absolutely does not care about the interests of the parties involved except as they reflect upon him. Start with this, and you already know a lot. Start with this, and you already know that there are no real answers to any of these questions.

It is not quite fair to say that Donald Trump lacks core beliefs, but to the extent that we can take apart these beliefs they amount to Give Donald Trump Your Money and Donald Trump Should Really Be on Television More. The only comprehensible throughline to his politics is that everything Trump says is something he’s said previously, with additional very’s and more-and-more’s appended over time; his worldview amounts to the sum of the dumb shit he saw on the cover of the New York Post in 1985, subjected to a few decades of rancid compounding interest and deteriorating mental aptitude. He watches a lot of cable news, but he struggles to follow even stories that have been custom built for people like him…

His mental life is drastically impoverished, and yet he loves to talk – he talks a lot, he does all the talking, he has no interest in listening to other people talk, he’s that windbag bore who traps you somewhere and embarks on an anecdote you can tell he’s told a million times before and he will not stop. That’s why he loved campaigning so much and why he keeps holding “rallies” – he got to talk and talk and talk and talk, and people would cheer him and wave flags. He has nothing to say but he never shuts up.

Trump doesn’t know anything or really believe anything about any topic beyond himself, because he has no interest in any topic beyond himself; his evident cognitive decline and hyperactive laziness and towering monomania ensure that he will never again learn a new thing in his life.

…

To understand Trump is also to understand his appeal as an aspirational brand to the worst people in the United States. What his intransigent admirers like most about him—the thing they aspire to, in their online cosplay sessions and their desperately thirsty performances for a media they loathe and to which they are so helplessly addicted—is his freedom to be unconcerned with anything but himself. This is not because he is rich or brave or astute; it’s because he is an asshole, and so authentically unconcerned. The howling and unreflective void at his core will keep him lonely and stupid until the moment a sufficient number of his vital organs finally resign in disgrace, but it liberates him to devote every bit of his being to his pursuit of himself. Actual hate and actual love, as other people feel them, are too complicated to fit into this world. In their place, for Trump and for the people who see in him a way of being that they are too busy or burdened or humane to pursue, are the versions that exist in a lower orbit, around the self. Instead of hate, there is simple resentment—abject and valueless and recursively self-pitying; instead of love, there is the blank sucking nullity of vanity and appetite.

…

The rest of the world is an abstraction to him, a market to exploit; there is no other person in it who is real to him. They’re all supplicants or subjects, fans or haters, but their humanity is transparently not part of the equation. What other people might want, or indeed the fact that they could want at all, is crowded out of the picture by the corroded and corrosive bulk of his horrible self.

There is no room for other people in the world that Trump has made for himself, and this is fundamental to the anxiety of watching him impose his claustrophobic and airless interior world on our own. Is Trump a racist? Yes, because that’s a default setting for stupid people; also, he transparently has no regard for other people at all. Does Trump care about the cheap-looking statue of Stonewall Jackson that some forgotten Dixiecrat placed in a shithole park somewhere he will never visit? Not really, but he so resents the fact that other people expect him to care that he develops a passionate contrary opinion out of spite.

That’s a gem of an insight.