" For Trump, loyalty is a one-way street."
It is quite right to say that Trump is only loyal to Trump. There are those whose bad behavior, broken promises and disloyalty to him never seem to trigger Trumps rage. He seems oddly and consistently docile and obsequious in the face of world dictators such as Turkeys Recep Tayyip Erdogan, Saudi Crown Prince Mohammed bin Salman, North Koreas Kim Jong Un and most of all, Russias Vladimir Putin. They can break promises (as Kim did in resuming missile testing and Erdogan did in violating the phony truce), take advantage of his insatiable need for flattery and induce him to take ludicrous positions that provoke domestic outrage (e.g. exonerating the Saudi crown prince of responsibility for journalist Jamal Khashoggis murder, siding with Putin over the word of U.S. intelligence agencies on 2016 election interference). Meanwhile, Trump will betray his country, as he did when inviting Russian interference in 2016 and extorting Ukraine to interfere in the 2020 race.
Trump will turn against every aide, ally and member of Congress who proves to be unhelpful to him personally. For Trump, loyalty is a one-way street. People are means to an end, and their concerns and feelings are irrelevant to Trump. Since he cannot imagine anyone following conscience, principle or laws, there is no excuse for defying him. (Remember former attorney general Jeff Sessions, who had the temerity to recuse himself from the Mueller investigation?)
https://www.washingtonpost.com/opinions/2019/11/18/why-trump-turns-everyone/