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Eric Schnapper, the lawyer who represented the families in the Twitter case, said it sometimes didn’t seem like the companies really were trying.

Immediately after Mr. Schnapper raised it, Justice Ketanji Brown Jackson moved the lawyer on to talk about the intricacies of blame and how much assistance an enterprise had to give to a terrorist operation before becoming liable.

In Tuesday’s argument, the Biden administration sided mostly with the family of a different terror victim — also represented by Schnapper — which was suing Google’s YouTube for its algorithms that recommended ISIS-related videos.

University of Washington law professor Eric Schnapper, representing the plaintiffs, said they did not have to show that Twitter’s actions led to a specific attack, but that they aided the “terrorist enterprise.”

But Barrett also pressed Schnapper for any specific link to the attack in Turkey.