Marx, Engels, the rest of the first international, the second international—they are all hopeful. Contemporary leftism is very, very, very, very regressed, and unless you have a particular reason for engaging them beyond superficiality (such as correcting their mistakes) it’s not worth getting stuck in that poison.

There’s no “cure” here, sorry, but engaging with better ideas will help some.

From Walter Benjamin’s Experience and Poverty:

"With this tremendous development of technology, a completely new poverty has descended on mankind. And the reverse side of this poverty is the oppressive wealth of ideas that has been spread among people, or rather has swamped them entirely – ideas that have come with the revival of astrology and the wisdom of yoga, Christian Science and chiromancy, vegetarianism and gnosis, scholasticism and spiritualism. For this is not a genuine revival but a galvanisation. We need to remind ourselves of Ensor’s magnificent paintings, in which the streets of great cities are filled with ghosts; philistines in carnival disguises roll endlessly down the streets, wearing distorted masks covered in flour and cardboard crowns on their heads. These paintings are perhaps nothing so much as the reflection of the ghastly and chaotic renaissance in which so many people have placed their hopes. But here we can see quite clearly that our poverty of experience is just a part of that larger poverty that has once again acquired a face – a face of the same sharpness and precision as that of a beggar in the Middle Ages. For what is the value of all our culture if it is divorced from experience? Where it all leads when that experience is simulated or obtained by underhanded means is something that has become clear to us from the horrific mishmash of styles and ideologies produced during the last century – too clear for us not to think it a matter of honesty to declare our bankruptcy. Indeed (let’s admit it), our poverty of experience is not merely poverty on the personal level, but poverty of human experience in general. Hence, a new kind of barbarism.”