I agree that Europe is anomalously peaceful, as long as you’re nowhere near Russia. Japan is also super peaceful. Regarding Liberia, I straight-up don’t believe the numbers. Collecting accurate statistics like that requires a government that is a) fully functioning, b) effective, c) honest and d) actually controls all the territory in the country. Between all those requirements, it rules out most of Africa, most of South America, and large chunks of Asia and the middle east.
Crime in the US is down quite a bit. It’s also down in a lot of other places. However, there’s a larger point here. If you choose your place to live based on a murder rate of 0.0005 vs 0.0003, and ignore things like freedoms, history, laws, economics, culture, diversity, larger societal trends and war, you definitely deserve the suboptimal outcome you will almost certainly get.