Anyone who really hankers after a world without guns would do well to try the 12th Century which was not a nicer place for lack of guns. The same firepower that makes it possible for one homicidal maniac to kill a dozen unarmed people also makes it that much harder to recreate a world where a single family can rule over millions and one man in armor can terrify hundreds of peasants.
Putting miniature cannons in the hands of every peasant made the American Revolution possible. The ideals of the Declaration of Independence and the Constitution would have meant very little without an army of ordinary men armed with weapons that made them a match for the superior organization and numbers of a world power.
Would Thomas Jefferson, the abiding figurehead of the Democratic Party, who famously wrote, “The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants”, really have shuddered at the idea of peasants with assault rifles, or would he have grinned at the playing field being leveled?