What Was Thomas Merton Thinking?

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Via Fr. Z., this 1947 Thomas Merton poem, from Figures For An Apocalypse, VI:

In the Ruins of New York
Oh how quiet it is after the black night
When flames out of the clouds burned down your cariated teeth,
And when those lightnings,
Lancing the black boils of Harlem and the Bronx,
Spilled the remaining prisoners,
(The tens and twenties of the living)
Into the trees of Jersey,
To the green farms, to find their liberty.

How are they down, how have they fallen down
Those great strong towers of ice and steel,
And melted by what terror and what miracle?
What fires and lights tore down,
With the white anger of their sudden accusation,
Those towers of silver and of steel?