After six months in office it is apparent that President Trump is not modifying his obnoxious behavior at all. I’m no psychologist but I would guess there are two reasons. Given his gargantuan ego, he probably thinks he can do anything he wants. Since he behaved badly during the campaign and still won, he probably sees no reason to change. Last time he ran against a horrible candidate who used a disastrous strategy. He may not be so lucky next time.
It is now apparent that part of his persona is a total lack of gratitude for those who helped him. Eighteen months ago few expected him to be nominated let alone elected. Jeff Sessions was the first senator to support him. He was an active campaigner and key advisor. Now he is our Attorney General.
He wisely recused himself when the Russia probe began. Nobody would believe the results of an investigation headed by someone so close to the campaign. Trump threw him under the bus by publicly criticizing his decision. Sessions offered to resign but was turned down. I bet he wishes he had stayed in the Senate.
Those working for Trump (and not married to his daughter) probably realize that they can expect no loyalty and could suffer the same fate as Sessions.