This research note comments on the recent random killing research in Japan in regard to their chosen definitions, causes and prevention policies. Apart from very intense cultural, social and business exchanges, Taiwan and Japan share very similar legal, political and economic structures. The experience and research in Japan on random killing cases may have the potential to offer Taiwan a different perspective for further analyses. The research note argues that, unlike Japan, which only focuses upon number of victims, random killing should, by definition, make more effort to analyze un-identified motives. Second, social isolation and significant extreme or polarized personality are key factors of previous random killing offenders in Japan. Given the value of this finding, it is still unclear if these factors are shared by all types of such offenders. Finally, while the Japanese research points to enhancing interpersonal relationships, reconstructing family functions, education reform, and improving workplace environment as possible prevention policies, this paper argues that these policies won't be applicable to Taiwan until Taiwan steps away from its obsession with severe punishment of individual cases.