== further topics for expansion == 

 I'm making a note here so I don't forget, and perhaps others are interested in researching the topics. 

 * Muri-shinju (murder-suicide, usually mother (sometimes father), will kill their children and then herself), also called "ikka-shinju" in media.  Sources: ,  

 * Apparently police sometimes will count a muri-shinju (or otherwise suspicious death) as a suicide to lower the homicide rate.  Need sources and further investigation.