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26 fall short. Plaintiffs do not claim that defendants intentionally associated themselves with ISIS’ operations or affirmatively gave aid that would assist each of ISIS’ terrorist acts. Nor have they alleged that defendants and ISIS formed a near-common enterprise of the kind that could establish such broad liability. These allegations are thus a far cry from the type of pervasive, systemic, and culpable assistance to a series of terrorist activities that could be described as aiding and abetting each terrorist act.

To be sure, we cannot rule out the possibility that some set of allegations involving aid to a known terrorist group would justify holding a secondary defendant liable for all of the group’s actions or perhaps some definable subset of terrorist acts. There may be, for example, situations where the provider of routine services does so in an unusual way or provides such dangerous wares that selling those goods to a terrorist group could constitute aiding and abetting a foreseeable terror attack. Cf. Direct Sales Co. v. United States, 319 U. S. 703, 707, 711–712, 714–715 (1943) (registered morphine distributor could be liable as a co-conspirator of an illicit operation to which it mailed morphine far in excess of normal amounts). Or, if a platform consciously and selectively chose to promote content provided by a particular terrorist group, perhaps it could be said to have culpably assisted the terrorist group. Cf. Passaic Daily News v. Blair, 63 N. J. 474, 487–488, 308 A. 2d 649, 656 (1973) (publishing employment advertisements that discriminate on the basis of sex could aid and abet the discrimination).

In those cases, the defendants would arguably have offered aid that is more direct, active, and substantial than what we review here; in such cases, plaintiffs might be able to establish liability with a lesser showing of scienter. But we need not consider every iteration on this theme. In this case, it is enough that there is no allegation that the platforms here do more than transmit information by billions of