How do you reduce the effectiveness of a movement or a thought without making it obvious that you're doing so?
Use every media outlet you possibly can to portray everything about this movement in the most negative way you can, so that to support it is equivocated with insanity, savagery, and ignorance.
Invite only 1 dimension of this movement to be seen, so it is easier to attack. Create the largest separation between supporters and opponents as you possibly can, so that compromise is not a valid option.
I mean, shit, I want you to think about this for just a second. Don't jump to conclusions so quickly because that conclusion is apparently in agreement with your world view. Just give this a few minutes of thought. If you believe that the media is so powerful in influencing Hilary's popularity, if you believe that her position was only reached by manipulation of media, how the -blam!- are you not going to question the media's influence on situations like BLM? How? How are you going to tell me, that one opinion is a completely deceitful production of the media, but the other is a valid outlook on reality?
Big Brother is watching, and you all look like fools to be spun by the "this is not propaganda" propaganda. The easiest way to control the ignorant and paranoid.