Pistachio took Malik down non-lethally and stood in front of the main console. He was stuck between a rock and a hard place:
1. Let the execution go through: The world gets cleaned, but millions die, and he's part of the killing.
2. Wreck the system: Bad guys live, and things stay messed up, but humanity survives.
Pistachio picked a third, risky option. He dropped a virus that messed with the implant data. Instead of killing people, it broadcast their crimes and who they were on every screen, everywhere, all the time, sort of like a permanent digital tattoo while also shutting down the kill switch.