> Admittedly, there are potential harms: the more popular the video becomes online, the more it may inspire future terrorists, both to commit terrorism in the first place and to livestream it.

I would add, emotional harm to the families of the victims as well. If there was a video of someone in my family getting murdered out there, I'm sure it would cause me considerable stress to know that people were intentionally watching it happen, and it was being widely distributed.