Of course, you're not taking any of it into context. I compared Japan and China because of their similarity in societal structure, in that they're both East Asian (yes, this may have been more racy). The Korean countries are far more compatible for comparison in that they're both similar in most ways except the fact that one follows the Supreme Leader and the other is more democratic than such. Next, Venezuela v. Mexico were also compared to each other due to the fact that both of them are dealing with a rampant drug issue. You should realize that I only picked countries that were comparable to each other because anomalies like the U.S. is incomparable to most countries.
Did you also forget the fact that Japan and Korean's economy industrialization started 20-30 years early than China? Thus they are more wealthier? Or how about let's compare homicide rate of democratic Philippines vs China, which is actually 5 times worse.
Oh and btw, difference between China and Japan is actually very small.
Or let us compare the democratic Mexico and Colombia with Cuba, which is again5-6 times worse.
This debate is about democracy vs authoritarianism, homicide rate have nothing to do with this, for every correlation you find, I can find more to contradict your data.
So if you want to argue that democratic nation makes safer society, I can also argue from the data that authoritarian nation makes safer society.