So, the author basically draws the conclusion that Things are Very Bad, (primarily) backed by a number of statistics, as well as his own perspective seeing people in bad situations as a psychiatrist.
I - strongly - disagree.
First of all, like the author says, these statistics are most likely inflated, "since I took them from groups working on these problems and those groups have every incentive to make them sound as bad as possible".
Secondly, even if you take the numbers given as fact, this is incredibly bad statistics (like most statistics not done by actual statisticians.)
Specifically: Most of these problems go hand in hand. If you were physically abused as a child, there's a higher chance you were also sexually abused as a child. If you were abused at all, there's a higher chance you'll go to prison. If you have chronic pain, there's a higher chance you'll become a heroin addict. If you're a heroin addict, there's a higher chance you'll go to prison. If you went to prison, there's a higher chance you'll be unemployed after.
I have made it one of my main life goals to meet all kinds of people. Really _all_ kinds: homeless people, extremely rich people, devout Muslims, devotees of all religions (Bahá'í, Hare Krishna, you name it), "normal people" around the world, farmers, writers, surrealists, artists, drug dealers, geniuses, idiots, assholes, extremely kind people...
One thing I've found is that the good (and the bad) seems to clump. If you get lucky and end up with some of (good friends|good family|good partner|good financial situation|good career|good health|happy) you will often end up acquiring some of the others. The reverse also works. If you had a terrible childhood, that often leads to crime/drug use, which can lead to prison, which most always leads to further problems in life. So, in a room of 100 people, maybe:
- 9% were abused as a child
- 1% were in prison
- 7% were depressed
- 2% were addicted to heroin/meth/prescription pills
- 10% were very unhappy with their life
- 7% had chronic pain
...but 90/100 had none of the above, because most of those overlapped.
I'm not saying that the world is perfect, but rather that many negative things clump.
TL;DR: If one person in 10 is sad, one is poor, one is sick, one is a heroin addict and one is in prison, that doesn't mean 6/10 people have one of these issues... perhaps 9/10 are fine, and it's just one person who's got all of those issues. Which of those 10 do you think is going to a psychiatrist?
Further note: In America, the cycle of poverty/jail/addiction can trap entire families for generations. In other countries, government assistance can take the worry of housing or medical care off your back either permanently or long enough to work on other problems.