I don't understand why this post and some of Dmytry's comments are downvoted so hard.

I'm going with the position that the post got the votes that it deserved. It's not very good thinking and Dmytry goes out of his way to convey arrogance and condescension while he posts. It doesn't help that rather than simply being uninformed of prior work he explicitly belligerently defies it - that changes a response of sympathy with his efforts and 'points for trying' to an expectation that he says stuff that makes sense. Of course that is going to get downvoted.

The idea might be far-fetched, but certainly not crazy, self-contradictory or obviously false.

It isn't self-contradictory, just the other two.

Seriously, complexity maximisation and "This also aligns with what ever it is that the evolution has been maximizing on the path leading up to H. Sapiens." That is crazy and obviously false.

It is not such a big leap to suggest that our snap moral judgments likewise result from a complex, or at least hidden, subconscious reasoning.

Of course that is true! But that isn't what the post says. There is a world of difference between "our values are complex" and "we value complexity".