I agree in some ways. Nature itself is an incredibly diverse system ranging from tremendous beauty to great cruelty for the mortal individual. When viewed as a whole, it seems impossible to draw a final judgement beyond a visceral feeling of awe. The old saying applies; you don't see things as they are, you see things as you are.
Life on this small planet dates back 4 billion years, yet our recognisable modern humanity is a mere matter of centuries old. In that flash of time, mechanistic human systems have taken cruelty and dehumanisation to new extremes, including the horrors of factory farming, animal testing, sex slavery, child labour, warfare and of course the ever-delightful Holocene mass extinction event.
I agree with the sentiment that ignoring the cruelty and portraying humanity positively is inaccurate, harmful and perhaps the ultimate injustice in itself. Brutality should not be normalised nor covered up. As a metaphor, I always felt a particular fury towards the old McDonald's characters (Grimace, Birdie, etc.) given that their role was to brainwash children into associating a corporation brutalising millions of factory farmed animals with something friendly and happy. A smiling mask upon a face of death.
And yet, given that we all find ourselves here, people seem to have come up with several possible solutions. Some strive to engage politically to bring about positive change. Some react with total apathy. Some try to live ethical lives. Religions all acknowledge the problem (whilst sometimes being a cause of it) and offer various interpretations of salvation. Philosophically speaking, suicide could indeed be a legitimate solution, so long as we discount the possibility of someone with good health making an even better contribution.
Having said all that, the tone of OP's message makes me feel concern for her wellbeing. It was only last year that she spoke of her online course, her appreciation of some humour and very relatable struggles with everyday life. She has slowly descended into a pitch-black worldview of density, darkness and repetitiveness.
Posts like these have been cherry-picked and quoted by the media wanting to portray us as a death cult actively promoting self-harm. And in fairness, because this worldview contains its own unacknowledged bias, it also risks being a dubious influence on others making life-or-death decisions.
And yet, as this viewpoint drifts beyond what even most suicidal people can relate to, it is also easy to portray people speaking that way as a caricature of a Harry Potter-esque lord or queen of darkness. Yet there is a real person there, suffering with a tragic combination of personality traits that block any possible solution from entering, drifting ever deeper into the abyss.
I don't have an answer or a solution, but I encourage everyone to strike the right balance between showing compassion for the OP's psychological state while also recognising the perils of viewing the world through black-tinted glasses.