From an engineering standpoint, eliminating almost all life on a planet is trivial for anyone capable of interstellar travel. Real easy to make it look like an accident too. Getting away with it depends on their opinions of circumstantial evidence.
From an engineering standpoint, eliminating almost all life on a planet is trivial for anyone capable of interstellar travel. Real easy to make it look like an accident too. Getting away with it depends on their opinions of circumstantial evidence.