
Tonia P. answered 10/22/19
Ph.D. in English Literature with 20+ years teaching experience
As Curt H. says, there is no "right" answer, only one that best suits your reading of the poem. Whether the poem overall is a treatise on the evils of capitalism, I won't venture to say, but it is clear that Blake sees a great deal of misery in London but believes that that misery is because we have created mental systems that enslave us: our minds have created the manacles (handcuffs, chains) that create the misery we feel.