Reaction to Wills O Issacs Group 69 which had the mission to stop JLP electoral advances into Kingston Metro area. They used stones, knives and one pop guns. This is what started the escalation.
Neither PNP nor JLP can claim high ground over gun violence. Burry Boy/ Feather mop ran riot in Kingston from 72 to 76 (as the GoJ turned a blind eye), though they started in 67 already.
JLP had their slew of gunmen and enforces as being in the minority in Kgn Metro, they developed a siege mentality and used that to justify their atrocities.