What distinguished Simmons from other mass killers was the insularity of his violence — the majority of his victims were members of his own household, bound to him by blood and dependency. His crimes unfolded over the course of a week in late 1987, beginning within the family he had long controlled through isolation and abuse, and extending outward to two others with whom he had unfinished grievances. He declined to appeal his death sentences, a posture consistent with someone who had already determined the outcome he wanted.

Rogers operated across state lines during a months-long crime spree in the mid-1990s, leaving a trail of victims that drew federal attention and landed him on the FBI's Ten Most Wanted list. His convictions in both Florida and California resulted in dual death sentences, and suspicion extended to additional murders across the country that were never fully resolved. The breadth of his movement and the speed of his escalation made him one of the more notable fugitive cases of that decade.

His position as a taxi driver gave him both access and cover — a familiar urban figure offering rides to women and girls who had no reason to distrust him. Operating in and around Alto Hospicio between 1998 and 2001, he used the remote terrain and abandoned mines of the Tarapacá Region to conceal his victims, a pattern that continued for years before authorities closed in.

His tenure as Argentina's de facto president was brief but consequential, defined by the continuation of the Dirty War — a campaign of state-sanctioned disappearances and killings — and a miscalculated military gamble in the South Atlantic that ultimately ended military rule. The Falklands invasion was in part a political maneuver to shore up a regime weakened by its own repression and economic failure, and its defeat by British forces accelerated a democratic transition that might otherwise have taken longer. He was later convicted of war crimes, pardoned, and then faced renewed charges, leaving a legal record that tracked the arc of Argentina's reckoning with its authoritarian period.