Just a thought or two (again) on the great radio silence of space in the face of a probable multitude of life-bearing planets in the universe.
Even if a species gets smart enough to avoid thermonuclear suicide or environmental degradation, there's another hubris trap for any sapient species.
It's likely that the quest for space warp technology will also produce a series of mistakes about quantum black holes, which could destroy an interplanetary species that hadn't spread beyond its home system.
The voice of conventional theoretical physics assures us these would be harmless. But governments continue to pour massive amounts of money into research on elementary particle physics that's pretty transparently intended for the discovery of a new super weapon. The creation of a quantum block hole that didn't "dissolve because of quantum effects" would be a extinction-level disaster for any species not spread out over light-years already.