The Forgotten Four was a domestic violence mass murder of acquaintances that was done quickly and the perpetrators caught and convicted fairly quickly. It doesn't make the victims any less dead or their loved ones any less sad and angry, but there was a resolution.
There was a similar crime in Bridgeport, CT in 1990, the murder of four friends and relatives which might have been forgotten as quickly, except that one of the victims was a 5-year-old boy forced to bury his face in a sofa cushion before being shot in the head (his 2-year-old brother was pistol-whipped but survived.) This also began with domestic violence and misplaced jealousy, and the murderer was fairly easily identified, arrested, and convicted (life without parole.)
http://articles.courant.com/1991-07-...hase-convicted
http://articles.courant.com/1991-10-...ence-courtroom
The Wichita Horror was by all accounts a random choice of victims event that involved hours and hours of torture and humiliation beforehand, and if one victim had not somehow survived and was capable of reporting it, the murderers would either not have been arrested, or for a long time and after more murders. This made it resonate and made it more memorable. That there CAN be collateral damage and additional murders of unrelated victims in a domestic violence situation before an arrest is made, does not usually occur to most people and reduces fear of these events, but seemingly "random" crimes terrify.