Basically for the powers that be, a movement like this HAS to be co-opted and allowed to play out in some way, because otherwise it will build until it becomes too easy for their enemies to lead the movement and use it to seize power.
Consider for a moment what happens if antisemitism is suppressed while it continues to grow, until eventually the only place people can go to be heard is Nation of Islam. Then all of the sudden *boom*, mass conversion, and the Anglo-American elites are getting thrown off of buildings because they were unable to get one of their stooges to take over and lead this social phenomenon.
Napoleon was reported to have said: "I found the crown laying on the ground, and I picked it up with my sword". You don't want to leave the crown laying on the ground.