Look at the countries with the highest murder rates: Honduras, El Salvador, Venezuela, Colombia, Mexico, Brazil, South Africa, DR Congo, South Sudan, Congo, Papua New Guinea, Nigeria, Haiti, Costa Rica, Philippines.
Look at the countries with the lowest murder rates: Japan, Singapore, Iceland, Indonesia, Austria, Switzerland, Norway, South Korea, UAE, Czech Republic, Poland, Spain, China, Saudi Arabia, Italy, Hong Kong, Sweden, Germany.
The USA is in the middle of the pack, at 3.9 per 100,000. Honduras is the highest at 84.6, most of the lowest cited above are at less than 1, and all of them are less than 2.
So, low murder rates seem to correspond to wealth and freedom, or wealth and totalitarian governments.
High murder rates seem to correspond to poverty, chaos, and superstition. Many of the most murderous countries are majority Catholic or Christian. Of course, voodoo, santeria, death cults, and other forms of shamanism and animistic beliefs are common in the murderous countries as well.