Federalist society is supporting textualist interpretation of the law. If you want the law to be different, then change the constitution. Having overly expansive interpetations of the constitution to make the law what you want is being an activist. Textualism is just going by what the law says.
They decided that the 14th amendment prohibition on insurrectionists being able to hold Federal office did not apply to Trump because he is not an officer of the United States (despite the fact he holds the "Office of the Presidency"). If that isn't deliberately misreading the actual words of the statute to get the result you want, what is?
This was a unanimous decision by the Supreme Court and I think a large part of it was that an individual state could use this for political gain. As Kagan said during oral arguments: "I think the question that you have to confront is why a single state should decide who gets to be president of the United States..."
