Riots have been prevalent throughout American history you can go back as far as the Boston tea party for reference. What you're really saying is people of color shouldnt riot if white people aren't rioting. During plenty of riots in the 17 and 18 hundreds African American slaves, free American Americans and native American Indians joined white people in various riots as well as rioted on their own sometimes with the support of other whites, while standalone riots without the support or aid of white people usually led to slavery, jail, death.