User blog comment:Callumthered/Why always Nukes?/@comment-1310192-20120120225056

Because a "superweapon" doesn't work in the case its regular catapults everyone has, so they design cannons. Then larger cannons. Then torpedoes. Then bombs. And then, when cheap manufacturing projectiles are useless because everyone has them, a larger bomb is discovered. Since everything BUT the Atomic bomb is much theoretical OTL and it would make that a sci-fi ASB, then atom bombs are invented.