How does the monsters are due on maple street relate to what is happening now

Maple Street, U.S.A., late summer. A tree-lined little world of front porch gliders, barbecues, the laughter of children, and the bell of an ice cream vendor. At the sound of the roar and the flash of light, it will be precisely 6:43 P.M. on Maple Street...This is Maple Street on a late Saturday afternoon. Maple Street in the last calm and reflective moment - before the monsters came.But now... Terence A. Monahan, the Police Department’s chief of department, explained the aggressive approach while speaking to reporters in East Midtown area in Manhattan, where officers dispersed one group of protesters.