From John C Wright's blog:
Leftism is not a political philosophy or a way of thinking; it is a
social mechanism for enforcing uniformity of opinion, and a
psychological mechanism for accusing others of one’s own flaws in order
to award oneself unearned moral superiority.
In order to be logically self consistent, a Leftist would have to
reject all values, all thought, all life, and accuse all things. No one
can do this. Hence, there is no such thing as a pure Leftist, a complete
Leftist or a logically-consistent Leftist for the same reason that
there is no such thing as a disease without an underlying organism at
one time healthy which contracted the disease.
The Leftist embraces
hypocrisy, and accuses some things and not others, some people and no
others, even though logic sees no difference between what is pardoned
and what is condemned.
They are all illogical, all arbitrary, all hypocrites, because no one
can consistently serve an anti-human death cult and remain alive.
consistent Leftist, wild with overpopulation fears, would kill himself
on the instant by withholding his breath, so as not to breathe out
carbon dioxide and ruin the world. An inconsistent Leftist will spend his
life accusing others of the dangers of imaginary environmental
disasters, and flies around in a jet, lives in an energy-absorbing
mansion, and so on.
So when I speak of ‘Leftism’ I speak of the idea, or, to be precise,
the anti-idea. I do not speak of the people semi-loyal to that idea. And
all Leftist people are only semi-loyal.