It's the failure of the human race.
We've lost human compassion to treat one another with love & respect.
We've become such a violent species. Humans are full of hate & anger, greed & selfishness, destruction & combatiness.
We would rather fight than talk, seek revenge as opposed to forgiveness, destroy than rebuild, argue than listen.
With all the stressors in life, such as seeking a good job & career, earning good money, obtaining a college education, forming good friendships, seeking a suitable mate & getting married, staying healthy, etc, we are constantly comparing ourselves to others.
And when things break down or we experience bad luck and fail such as unable to get a good job or earn enough money to live, unable to get a college degree, unable to find a suitable mate or suffering from a divorce, become seriously ill or a love one becoming ill, we find ourselves in depression & despairity unable to cope with the problems.
We find very little compassion from our fellow humans who become indifferent to our shortcomings many times telling us it's all our fault.
Depression, stress, anxiety, etc - destroyers of the modern human.