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I think the key difference is the way a society evolves as it moves farther away from resource scarcity and towards enlightenment. Modern problems with gun crime are not really comparable to a sci-fi universe where space ships are common. Resource gathering and distribution is much more efficient thanks to technology and magic, which means that there are far fewer people that are willing to resort to violence as a means of survival or getting ahead.
A better quality of life means fewer people will be desperate to commit crimes, fewer people that place little to no value on sentient beings, and fewer people that would risk the freedoms they enjoy by pulling a gun for all but the most important reasons.