IRA had little choice but to activate their own justice system

Anger is an inevitable consequence of abuse but it does no good at all to lash out at the very people who tried to help deal with the abuse. The anger is only appropriately directed at the person who committed the abuse, but even then lashing out does no healing, I know from direct personal experience.
What I am more upset about is the attack on the IRA and Sinn Fein by people living in the South. My question to all of you is, where were you when your countrymen and women were being beaten, killed, denied jobs and housing, and had their lives destroyed over years, with the active collusion of the RUC?