Trump likes to keep his enemies close and comfy until he is ready
The politics of division, this strategy is multi layered. 1) Get blacks feeling like the white people are out to get them and manipulate their emotions to get votes. 2) Get whites angry by accusing them as a whole race and triggering the weaker minded ones to go full retard white nationalist so they can a have a visual boogey man confirming to the blacks and other minorities that white people are indeed out to get them. Rinse and repeat escalating until it results in some type of violence to further exploit.