As I had hoped, the Secretary of Alien Strategies reports for duty:

Many species here on Earth have endured for millions of years while retaining “aggressive” tendencies, and even very “mildly” bellicose aliens, ones who would only exterminate us if they could make a plausible case that we might pose a future menace, should still be of great concern to us.  I sure don’t want to be exterminated “just in case.”  Wouldn’t it make more sense then to shut up until either we don’t look so menacing, or until we are strong enough to defend ourselves?

In retrospect there’s two reasons to be concerned about Robin in this position. Are we sure he’s not here on behalf on some future invading alien species to make us rational enough to accept their inevitable domination when they invade rather than fight them to the death as our irrational “humanity” may compel us to do? And even if he is human, if aliens do arrive can we say for sure he would not advise them that it would be more efficient to wipe us out?