There are two factors to consider. First, Trump craves praise and cannot bear criticism. He thrives when cheered and sulks when called out on his "alternative facts". Second, the Trumpians love to have a scapegoat. Their whipping boys include immigrants, homosexuals, Muslims and the free press. There must be someone to blame for their troubles and that someone must not be those responsible for enacting policy.
So we have this dynamic in play. A petulant president and a fearful base with an oversized megaphone to voice their opinion. In other words a liar and his enablers.
Actually, they blame everyone who disagrees with their blind adoration of Trump: they blame Republicans, Democrats, the media, feminists, immigrants, people of color, the leaders of our allies, everyone. It's just like some insane brainwashed cult.