Mind-forg'd manacles are created by people. They are common. Blake's sensitivity to people being hurt is great. That people hurt each other, and their own children, is awful :(
http://www.poetryfoundation.org/archive/poem.html?id=172929
London
BY WILLIAM BLAKE
I wander thro' each charter'd street,
Near where the charter'd Thames does flow,
And mark in every face I meet
Marks of weakness, marks of woe.
In every cry of every Man,
In every Infant's cry of fear,
In every voice, in every ban,
The mind-forg'd manacles I hear.
How the Chimney-sweeper's cry
Every black'ning Church appalls;
And the hapless Soldier's sigh
Runs in blood down Palace walls.
But most thro' midnight streets I hear
How the youthful Harlot's curse
Blasts the new born Infant's tear,
And blights with plagues the Marriage hearse.
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