Not just shock videos, but propaganda videos of things like IED or sniper attacks in certain warzones as well. The ability to distribute those videos plays a non-trivial role in why those attacks are carried out. Blowing up a car or two for the sake of the act itself isn't worth much, but the propaganda value of those videos shouldn't be underestimated.

If I were inclined to think that banning those videos would actually do anything to prevent people who wanted to see them from seeing them (I do not), I would assert that banning those videos would disincentivize the acts.