Seerow's Kindness is a law that forbids any Andalite from giving technology or revealing secrets to other alien races. It is the result of an incident where an Andalite Prince named Seerow gave technology to the Yeerks, who then used it to invade many planets throughout the galaxy and enslaved neighboring species.
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When Elfangor-Sirinial-Shamtul created the Animorphs using the Escafil device, this was considered a violation of Seerow's Kindness. To protect his brother's reputation, Aximili-Esgarrouth-Isthill initially agreed to take responsibility for that action after his first contact with the Andalite homeworld ("The Alien"), but this attempt was quickly seen through the first time he attempted to use such a lie to other Andalites ("The Decision").