I think that it is very easy to have a pessimistic view of the world. Why wouldn't we? The news tells us bad things everyday. Plus without realizing it we perpetuate certain "things we heard" that have no basis in fact. We all do it.
I've recently read a book called "Factfulness" that I highly recommend. Everyone I know that has read it has come away with a much more optimistic view of our world.
This Ted Talk is very similar in that takes actual statistics to show us some of our misconceptions.
I have been a fan of Steven Pinker since I read his book "How the mind works" years ago. I think he is right to be optimistic rather then pessimistic and I wholeheartedly agree that the The European enlightenment was the greatest intellectual achievement ever.
Overall the population is better off than they were but there have been some losers eg the Aboriginals in Australia and the San people in the Kalahari who have seen their way of life totally destroyed.
As for the future ?, Well that is entirely up to us isn't it.
I usually take statistics to heart, but I do not believe that is the whole picture! I judge how I find the climate of the people around me. If people are having to shield themselves from the suffering happening around the globe, because it leaves them with a kind of worry...how is that making people happier? I am not a believer!
Pinker is probably right about the trend up to now. Things have been getting better over all. But they are about to get a hell of a lot worse. Global warming + feedback loops + ocean acidification + overpopulation = mass extinction.
If he doesn't mention things like Fukushima, I would think he's using a somewhat myopic template. Our company's "miracle workers" (efficiency experts)`liked to say, "If it can't be quantified, it can't be measured," which in some respects seems a bit of a tautology.