It's more just that Far-Leftism is either intrinsically or instrumentally useful to them rather than being the product of a detachment from reality.

Vaush: Self-proclaimed communist who openly claims that CP is fine and that adult-child sexual activity can result in "positive" (his word) outcomes. He hilariously claims that this is an "empirically true fact", an obvious example of the misuse of science and of the grossness of scientism, i.e. of worshipping science to the point that you think it can even answer ethical questions and thus that science can justify pedophilia.

Destiny: Non-binary, non-heterosexual, habitual drug user if not outright drug addict, literal cuckold.

There are also miniature, budget, wannabee versions of these two, like Socialism Done Left and Xanderhal. But I do not know which identities they hold in order to comment on them more specifically.

Speaking of the instrumental usefulness of Far-Leftism to these two, in a Far-Right society, both would long have been imprisoned or executed. They understand this even if only subconsciously, and thus have every reason to oppose any potential remoralization of the society around them. The easiest way to prevent remoralization is, of course, to push society as far socioculturally Leftward as possible. When subjectivism, nihilism, hedonism, etc. are socially acceptable, such people are at their safest. Their extremism is thus to me the product of their will to survive as well as a tacit admission that they understand how degenerate they are, and fear that there will one day be repercussions inflicted upon them for the vile things they have said and done. It seems to me a mere survival strategy: in a world of abnormal, immoral degenerates, abnormal becomes the new normal. They thus become regarded as the popular and "normal" ones rather than as the outcasts and pariahs they should be. They have to corrupt the world in order to further their chances of survival.