It is poorly phrased central idea for a persuasive speech because it contains figurative language.
The persuasion needs facts which can be describes using literal language as opposed to figurative language which is often used in poetry though sometimes in prose also but it contains an explanation which is different from the literal interpretation.
For the Rodney King riots to be elevated to institutional discrimination, there would need to be evidence that the LAPD trained or sanctioned its officers engaging in a policy of regularly using physical violence as a form of oppression against people of color in Los Angeles.
