Well from where I stand, at first blush, he looks like a murderer and traitor.
But I know I do not have all the facts. I applaud taking bold action on a moral stance, but if the destruction materially worsens our position viz-a-viz the Unukalhai or any of the alien states, then he just committed treason. If he killed people legitimately performing their duties, he is a murderer. If somehow people were not killed and he was either under orders to destroy it for some reason (which does not seem likely given his announcement) or his actions actually benefited the USFP, by demonstrating our moral rectitude, then he is neither. But from where I stand, the burden of proof is on him.