Standing out in your Guardian article is the revealing bond Osorio had with his partners-in-crime:
Prosecutors have issued arrest warrants for nine other suspects who may have acted as accomplices.
Mauricio Arriaza Chicas, director of El Salvadors national civil police, said on Wednesday that the suspects included former police officers and former soldiers as well as people smugglers and others who helped lure the victims to their death.
On Thursday, dozens of people who believed their missing relatives could be among the bodies gathered outside the house, which was guarded by a heavy police presence.
Sounds very much like the confessed murderer and company developed an appetite for power, control, and blood letting, with the government's blessings during the ongoing genocide which lasted for years, against the indigenous, helpless, hopeless villagers and campesinos of El Salvador: people whose absolute poverty, without access to protections, left them all totally vulnerable, just as women are similarly vulnerable without strong, influential family members and allies to protect them if they are confronted in situations which might require any trust in strangers at close range.
Suddenly a very large leap in victims looms into view. It was awful, before this! Not a good breakthrough, at all. Hope absolutely every lost soul connected with this nightmare will be accounted for.
The tough guys apparently missed their happy days murdering citizens with the government's blessings, as agents of genocide. They couldn't live without taking life.
Thank you for the new information.