Yes, and as I understand it, in Texas the legal definition of HARM is broad. However, the practical application of the term, HARM, requires personal injury, property damage, pecuniary loss, or loss of some present legal right.
If the legal definition of HARM is broadened to include anything that a person can assert is harmful - "forged a letter from my girlfriend, hurt my feelings (maybe even broke up over the forgery), guilty of a felony" would be the inevitable result.
18USC912: Whoever falsely assumes or pretends to be an officer or employee acting under the authority of the United States or any department, ... and acts as such, or ..., shall be fined under this title or imprisoned not more than three years, or both.
The forger was pretending to be Killian. Even though he's dead, the forger was acting as if he was Killian some 30 years ago. The crime was committed recently. The statute only requires that a person impersonates an officer, motive notwithstanding. I would think this applies to the forger?