"2. Climate change won't end humanity itself, by all probability, people will be better off in 100 years even if we don't do anything about emissions. Better off in terms of life expectancy, poverty etc"

I highly doubt that if we don't do ANYTHING about emissions. Much of world's agriculture depends on predictable weather. If world's big bread baskets get disrupted badly enough, food prices will rise so much that starvation becomes a big problem in much of the world. Rich people may be OK, others not so much.