1. Maddow and MSNBC will not face any prosecution.
2. They won't face prosecution because they didn't commit a crime.
3. They didn't commit a crime under the statute you cited because they obtained the tax return from someone who was authorized to have it.
You can’t show it to the public without the consent of the person in the document.
As you can see in the third link above she was warned her not to it.
Yes Liberalism is a mental disorder.