The essence of our difference is that my immanent naturalism opposes your transcendent Romanticism in believing in the unity of opposites. So any dichotomy reflects nature's irreducible and necessary complexity. A holist is defined by accepting this principle as true. A reductionist is defined by an insistence that instead worlds can actually be broken apart and still make sense.
So - to use the dichotomy that seems most relevant to the pessimist's position - the complaint is that the world contains the bad. And yet the world ought to be good. Therefore the world is fundamentally imperfect and bad. Goodness now counts for nothing in the reductionist calculus that the pessimistic thinker constructs as his cocoon of thought.
But for me - just phenomenologically - that stance is ridiculous. I experience pleasure and pain as inextricably intwinned. I exercise hard because that produces the most exquisite mix of these two things. Likewise, I would live life hard for the same reason. Effort is intrinsically a pain and yet intrinsically a delight.
Reductionist thinking can make a paradox of this basic psychological fact. But holism instead demands its truth. It is natural that the coin of existence has its two complementary faces and the value of each is maximised when we are most truly alive.
So this is what you and DC signally fail to understand - the logic of nature.
You instead have become enslaved to the logic of machines. You think about existence in terms of monadic reduction. Life has to be either all the one or the other. So therefore any bad counts as a blemish on the perfect good, making the whole thing irredeemably bad as the only remaining option.
Yet this is simply to ignore the evidence of your own experience. It is to misunderstand your own nature by imposing on yourself the notion that you are a machine - a notion you then want to violently, romantically, transcendently, reject ... leaving you then with no rational position at all.
I instead understand my nature because I can see why pleasure and pain are psychically joined at the hip. Perfection in the real world lies not in one reigning absolute, the other banished from the kingdom. Instead to flourish is to live with that exquisite balance where you thrash yourself up mountains (both literal and metaphoric) as living hard is living best.
Of course pain can become overwhelming in life. Shit happens. Likewise you can "suffer" from an excess of ease and satisfaction. So imbalance is perfectly possible - indeed it is a given if balance is a goal that relies on the constraint of the accidental.
The standard ethics of the enlightenment should be coming into sight now - as the enlightenment was about humanity waking up to existence of nature (with the sharp understanding of the mechanical being the ironical handmaiden to this larger psychological awakening).
That is, humanistic ethics is focused on creating the opportunity to thrive. Society needs to be organised to remove the accidental sources of the good and the bad in the life of the individual. That way, the individual has the greatest opportunity to be the source of their own exquisite mix of joy and sorrow - to be actually fully alive and not one of DC's monotone zombies or your mechanical maintenance crew.
So pessimism is based on the completely faulty notion of ending the pain inherent in living. But you can see how naturalism only wants to remove the accidental pain - so as to maximise the scope for purposive pain. And likewise, naturalism would want to remove accidental pleasures, to make pleasure properly purposive.
It all makes sense once you have a proper theory of life and nature. You can see what is hollow and pointless about taking drugs - they are accidental sources of pleasure. Although people often take drugs as a crutch to aid socialisation. And so it gets complicated. Socialisation is a natural and purposeful thing - the context that our efforts at individuation require. Social interaction - done right, done hard - hits that exquisite balance of pain and pleasure.
Thus there is a crisp choice when it comes to the metaphysics underlying ethics and aesthetics.
You can go reductionist and view existence in brutely mechanical terms. Which itself must engender the dualistic reaction of the inarticulate howl of Romanticism's transcendental protest. Something has clearly been left out. But now there are no resources with which to think about it.
The alternative is the immanent holism of natural philosophy. Now we see that existence has irreducible complexity. It is meant to be dichotomous and thus about arriving at fruitful balances. And living hard sums that up as that means we are living the life that is the least accidental, the most individuated or personally meaningful. Life is meant to be a deliberate mix of pleasure and pain - the exquisite contrast which we ride so hard that any accidents that do occur are going to be ... spectacular.
Of course a further point in all this is that naturalism is also about nested hierarchies, so "living hard" becomes an imperative now to be balanced across all its many scales. This is where what is best for the individual may exceed what is best for a family, a village, a region, a nation, a planet.
Naturalism - as opposed to romantic/mechanical reductionism - grants mindfulness or semiotic meaning to all these levels of being too. So that larger balancing act, that larger definition of flourishing, has to be worked into the ethical and aethetic story too.
What did I say about irreducible complexity? Heh, heh.