S. Ct. Unanimously Rejects Mexico's Lawsuit Against Smith & Wesson

From Justice Kagan's unanimous (and, I think, correct) opinion in Smith & Wesson Brands, Inc. v. Estados Unidos Mexicanos :

The Government of Mexico brought this lawsuit against seven American gun manufacturers. As required by a federal statute, Mexico seeks to show (among other things) that the defendant companies participated in the unlawful sale or marketing of firearms. See [Protection of Lawful Commerce in Arms Act,] 15 U.S.C. §7903(5)(A)(iii). More specifically, Mexico alleges that the companies aided and abetted unlawful sales routing guns to Mexican drug cartels. The question presented is whether Mexico's complaint plausibly pleads that conduct. We conclude it does not….

[T]his Court has developed several … principles [defining aiding and abetting law]. First, aiding and abetting