The Degeneration of the True Liberal into Pseudo-liberal/communism

Why are some liberals capable of consistently
maintaining their true liberal socio-political character structure and others easily shift to the political extreme left and function like pseudo-liberal communist characters?
One reason is that the liberal character lives almost entirely in his superficial layer. As a result, he has little core contact and his thinking is either mechanistic or mystical. Those liberals who have mystical tendencies in their thinking will readily shift to the political left and join the “heaven on earth,” freedom peddling mantra of the pseudo-liberal/ communist. Those liberals who have no mystical tendencies will keep their true liberal identity and will often support the destructive social policies of their cohorts on the extreme left and vote for them but when pressed for a rational reason will not be able to justify why they are doing so.