Liberalism isn’t an intellectual belief, and certainly not a rational belief.
At the sheeperal level, it all boils down to people who believe the lie “I’m a good person”. They are “liberal” in order to advocate for causes that affirm that lie.
The commies, the truly dangerous “liberals”, have no such drive. Their drive is for domination. And they use the sheeperals’ desire to feel good about themselves in order to attain the power to impose that domination.
And communism and socialism are akin to nihilism... the religion of nothing.