How does Kennedy use parallelism to emphasize the potential for American society to become more divided

Kennedy used parallelism to emphasize the potential for American society to become divided by telling the people that a greater polarization (this means black against the white and white against the black) can cause bitterness and more hatred among each other.  If a black person will kill another person, this can cause anger and hatred on the white. The white will then kill another black. This can lead to a more divided society.

Explanation:

The question above is related to the speech of Robert Kennedy regarding the assassination of Martin Luther King Jr., who was an advocate of racial equality.

In his speech, he asked people to have compassion and to understand individual situation in order to replace violence that was happening in the society. Such effort can help everyone get beyond the difficult times.