There are two interesting things about Korea's murder rate. (a) It is very low. In the US the murder rate is was a little less than 5 per 100,000 people (or it was when Wikipedia published these numbers.) Contrary to public perception, that's actually rather low compared to most countries, but high for a highly developed nation. The rate in South Korea is less than 1/5 of the US rate, 0.9 per 100,000 overall. That puts it way down at the safe end. Only 20 countries out of 240 or so are as safe as South Korea. The other interesting thing is that men aren't killed that much more often than women in South Korea. 0.5 men v 0.4 women per 100,000. Lottery rates, either way. Men are killed 3.7 times as often as women are in the US, and that's kind of typical for countries with higher rates. But gender rates that are closer to equal are pretty typical of the countries like South Korea that have very low rates for both. Don't know why, but feel free to check out the stats: https://en.wikipedia.org/wiki/Homicide_statistics_by_gender . Whatver the reason, the murder rates for women in South Korea don't seem like a plausible reason for their astonishingly low birth rate, the lowest in the world now.