What excerpt below best suggests the root cause of the societal trouble the narrator encounters in “Once Upon a Time”?

Click here to read the story.

“The riots were suppressed, but there were many burglaries in the suburb and somebody’s trusted housemaid was tied up and shut in a cupboard by thieves while she was in charge of her employers’ house.”
"The alarm was often answered – it seemed by other burglar alarms, in other houses, that had been triggered by pet cats or nibbling mice.”
“He was masked; it could not be said if he was black or white, and therefore proved the property owner was no racist.”
“But to please her - for he loved her very much and buses were being burned, cars stoned, and schoolchildren shot by the police in those quarters out of sight and hearing of the suburb – he had electronically controlled gates fitted.”