That would entirely hinge on the degree to which the content was editorialised. If the video contains commentary and/or editorialising and/or editing that in an

That would entirely hinge on the degree to which the content was editorialised. If the video contains commentary and/or editorialising and/or editing that in any way implied that the occurrence was desirable or righteous, then it is terrorist propaganda and should be restricted without hesitation. If it was an opinion-free, propaganda-free raw unedited video of a newsworthy event that was filmed in a public place, then it probably shouldn't be banned—though publishers should still act responsibly if the material contains deeply offensive or distressing material, or if it has serious privacy implications. And that's just a proposed set of principles I came up with after three minutes of consideration—I'm sure with an extra 15 minutes we could come up with something even better. Point is, this isn't difficult. The fact that there are no bright clear lines doesn't preclude us as a society from drawing a line somewhere.