As you say in your question, this is a matter of culture. I don't live in South Korea, but I understand there are very few incidents involving fire arms, that is their culture and this is good for them. read more
The U.S. indeed has a different culture than Korea--actually a multiplicity of cultures, but Americans are not a different "race"--there are Americans of every race, creed, and culture (including Korean-Americans), and indeed this is almost fundamental to the definition of the US as a nation of immigrants. read more