1) But as Walter Benjamin said every document of civilization is at one and the same time a document of barbarism
2) No EVERY document - how is it possible for people to live as artists, musicians, philosophers etc.etc.? Because of the division of labour, with the majority of the population doing all the work that needs doing for a society - and society - to reproduce itself (producing food, bearing children, generating wealth etc. etc.)
This doesn't mean they are NOT documents of immense signficance that improve our condition. But tradition is also the ruling class carrying its spoils over the back of prostrate workers.
That would not be the same point debated though, I fear...
Firstly, those in power/owners/capitalist have no - or very little - time for culture, as they are consumed with "wealth creation", i.e. exploitation and then debauchery...
The working class has neither time nor energy, as they have to be exploited, not to mention that most would not have the tools with which to understand/enjoy/create it...
So, it remains mostly down to [a very small parts of] "middle" class[es] to carry on the culture as we know it... In the middle ages it was a few thousands, maybe tens of thous of people, largely in the monasteries, who kept up the best we had from the previous eras...
And if we're finickity: there are/were philosophers/arists/etc. who also worked all their lives or some of their lives as common labourers etc. [I know I did and quite a bit...

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For Adorno, as for Freud, we become who we (inviduated "human") by repressing what we are (social animal). This isn't to say that our history could or should have see us done otherwise, or that possibilities for alternative becomings have been exhausted.
Moreover, we do not have to agree with that assumption or their "assessment" [that "we are" allegedly "social animals"] etc. Just as they "invented" their view - we can invent ours...
The possibilities are not only two [we are not exactly obliged in any way to "traditional" models]. There are also more than 3 or 4! Indeed, we [as humans] can keep making new ones... Anything less would be seriously conservative, don't you think?
Now, keeping those options open and in one's mind at all times, during any and all analysis, plus working on them through an immanent critique of Modernity/"merely existing" should keep pessimism away!!!
