I respectfully disagree. There is one root cause that the author has missed entirely: the driving of God from our public square.
When we abandoned God, we abandoned the Christian world view that this world is the place of testing, not happiness. So much of the hopelessness and despair we suffer from today is due to the embracing of empty promises (materialism and hedonism) that cannot provide true meaning or purpose.
And when abandoned God, we abandoned His true system of morality and restraint, the check that keeps fallen Man from spinning out of control.
Every horrible thing that is happening can be traced to the catastrophically wrong decision we have made when in our wealth and pride we decided that God is no longer necessary.
I think it is certainly one element of it. Our secular institutions used to operate with a morality, however, that they don’t seem to anymore.
No doubt, God leaving the public square is a big part of it.