Problem: The "breach of trust" likely would turn the Gatekeeper vindictive and the GK could easily respond with something like: "No. You killed the planet and you killed me. I have no way of knowing that you actually can or will help humanity, and a very good reason to believe that you won't. You can stay in there for the rest of eternity, or hey! If an ETI finds this barren rock, from a utilitarian perspective they would be better off not meeting you, so I'll spend however much time I have left trying to find a way to delete you."