Maybe some alien civilization does know about us, but it slightly afraid since we spec’ed in the war tree instead of space travel.
They kept letting us advance our war machines until one day they needed us. To help stop a greater evil; since they went space exploration instead of guns
It’s possible, but once we get involved in the war, we’ll have the means of travel AND the guns, and of course, our insatiable desire to conquer.
They’re better off leaving us alone.