I think your recollection is a bit distorted, there were only two good guys killed during the riot, one policeman and one firefighter.
The Detroit police responded with an iron fist, shooting a lot of folks who were looting.
A total of only 43 people were killed not only by police and guardmen but looters themselves. It was not the holocaustic bloodbath by LEO that you are trying to make it.
And as a side note, on the day the riots started, my father, who was a Lieutenant in the TMU and lived on Detroit's east side, had started his vacation and was in Windsor with my mom and was coming back to the US when he saw smoke rising in the city. Since they had planned to spend their vacation up at their cottage in northern Michigan, dad drove mom up to the cottage, dropped her off and returned to their house in Detroit. He then called in to his precinct and informed them that he was available if they needed him but they never called him.
Even in the northwestern suburbs where 99% of the Whites fled,
You're kidding us, right? There was very little white flight from the east side "Grosse Pointes" or the Detroit side for that matter, which were closest to the 12th street riots. People stayed in their houses (probably armed) knowing that the riots were taking place downtown but prepared in the event it spread to their neighborhoods. Which it didn't......