Diction in London

The diction in "London", to say it midly is depressing. Everyone has "marks of weakness, marks of woe". Not one class of people he mentions from the working class, to the Church, or to the military is happy. Men and infants cry. But, I don't feel this poem's purpose is to be gloomy for the sake of being gloomy. Blake is trying to call attention to something. All the things going wrong in this city are not the fault of the people. They are the curses of society created by the Rulers: "Runs in blood down Palace walls". It is the fault of the detached Palace that causes the afflictions and the downfalls of marriages. This poem may have written to get the attention of the Palace and if nothing else to support the people of London.