At a certain point I would have had a lot of sympathy for human exterminism - ie. it comes up pretty quickly if you do the math that the balance of pain to happiness in life is usually in the red and that this world looks like an ocean of suffering from a particular vantage point.
Part of the problem is we're now looking out across the entire human race with great ease, greater communication than ever through the internet, global media, etc.. We forget that we're still an extrarordinarily young and dumb race, at least dumb with respect to the kind of cultural software we're still running and the wars and iniquities we have as a result. What I mean in saying that is I think the more we process these problems the more they'll evaporate - it won't be a smooth process and there will be breaches of human rights, staggering backward in some places, etc. but as far as what kind of place we like to think of as heaven or heaven-like, we'll probably find ways to get the world closer to that metric than not when the dust settles.
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“Love takes off the masks that we fear we cannot live without and know we cannot live within. I use the word "love" here not merely in the personal sense but as a state of being, or a state of grace - not in the infantile American sense of being made happy but in the tough and universal sense of quest and daring and growth.” - James Baldwin