This is bad either way, but it could have potentially started as as troll, although some of the marchers do join in. If you watch the video, it seems like the chant starts from behind the camera; could have been a legitimate marcher, could have been someone trying to start trouble. It starts as "we're not going shopping," and is then modified into "we're coming for your children." Personally, I lean toward it being legitimate, but could go either way.

EDIT: Forgot to include the video.

This is bad either way, but it could have potentially started as as troll, although some of the marchers do join in. If you watch the video, it seems like the chant starts from behind the camera; could have been a legitimate marcher, could have been someone trying to start trouble. It starts as "we're not going shopping," and is then modified into "we're coming for your children." Personally, I lean toward it being legitimate, but could go either way.