aliens

if an alien civilization tries to build a planetary bomb

then it's unwise to build it 

on the alien civilization's home planet 

instead it's wiser to build the planetary bomb 

on another planet 

preferably in another star system 

and even better between star systems 

and after the planetary bomb has been built 

then it can be moved to a base or spacecraft 

or be delivered to the target for detonation 

if an alien civilization tries to build a star system bomb

then it's unwise to build it 

in the alien civilization's home star system 

instead it's wiser to build the star system bomb 

in another star system 

preferably in a far away star system 

and even better between star systems 

and after the star system bomb has been built 

then it can be moved to a base or spacecraft 

or be delivered to the target for detonation 

if an alien civilization tries to build a galactic bomb

then it's unwise to build it 

in the alien civilization's home galaxy 

instead it's wiser to build the galactic bomb 

in another galaxy 

preferably in a far away galaxy 

and even better between galaxies 

and after the galactic bomb has been built 

then it can be moved to a base or spacecraft 

or be delivered to the target fo detonation