Why does Iago slip off so quickly once Brabantio comes down?

What is the victorian theme in the poem “beautiful city” by alfred, lord tennyson? beautiful city, the centre and crater of european confusion, o you with your passionate shriek for the rights of an equal humanity, how often your re-volution has proven but e-volution roll’d again back on itself in the tides of a civic insanity! a. civil unrest b. revolution c. confusion d. social justice