Because Anthropic is the final manifestation of EA and is about to raise two trillion dollars.

This is beyond absurd.

Effective altruism originates from the intention to rationally approach the obvious question, how to do the most good in the world. That's obviously not a bad thing?

The article here goes on a grotesque witch hunt, claiming baselessly things like "polyamory" was widespread among "the movements" adherents.

You here postulate, Anthropic was a "final" manifestation of that movement. How? Why? Do they practice polyamory there?

Trying to apply rationality in domains where it's ineffective is obviously a bad thing. In the real world, only a limited subset of issues can be reduced to logic and calculations. To believe otherwise is pure hubris, and if you've read the classical tragedies you know the results.

What now? The main thing about rational (logical) arguments is to make explicit the domain of their applicability and ensure that fits the given situation.

The social myth of important social questions not being amenable to rational consideration is a political tool, not scientific truth. The classical literature doesn't help there.