1) Many like her will do it just put black males in their place, if there is a disagreement. Many like her don't fail to remind black people that they are black and thus inferior...and often the use colourful language in doing so. You know, black shit, black bastard, n"""r, monkey, slave etc etc. Please see the video canada-man posted as but one example.
2) But many people (including black ones) are pulling those phones out to make sure the shit of yesteryear does not repeat itself. Some do it to have proof in case things start going against them. Are you seeing the benefits of cell phone video in the George Floyd murder, as well as the Arbery and Walter Scott one? Would you have believed that a noble police man would have stooped to planting evidence to justify the murder of Scott, had it not been for cell phone video? It must be noted that he almost got away with it even with the cell phone video!!!!