I won't deny institutionalized racism but there is more to this than that. In fact, institutionalized racism is intended, just not for the simple reasons we like to think.
In order to keep a population under control, you want 3 things:
Distractions: 'crises,' scandals, sports, entertainment 'news,' et cetera(this is why so many sports and entertainment projects are often heavily subsidized, they are the opiate of the masses)
Division Within: religious(Jews, Muslims, Christians), race, politics and even, again, sports and entertainment can and are used to accomplish this(this helps ensure any dissent is small and feeble and weakened by infighting)
Enemy Without: 'Terrorism,' Russia, N. Korea, Mexico, China, Iran, et cetera(this ensures that people rally behind the military and their campaigns, creating an inherent support for government even when they are dissatisfied with it in general)
Insititutionalized racism is meant to perpetuate the racial divide. It's meant to make it appear as if 'the man'(conceived as white men) is still trying to dominate other races. Other examples of this are Affirmative Action(which lends to the perception that the government caters to minorities) and ethnic surveys(which help to keep the division fresh in our minds without it being openly pointed out).
Furthermore, putting aside any claims that that mass shooting may have been a black flag op, it helps to make it seem as if the state is involved in protecting us by parading him around. It also serves to further deepen the racial divide so important to the state's domination over all of us.
It's not black vs. white, it's blue vs. you.