As I said, nothing was done without warning. PIRA gave more then a half hour warning before bombing Harrod's despite three civilians killed. Enniskillen was aimed at a patrol of troops.
As I said, the Volunteers did not set bombs to kill civilians, warnings were given ahead of time. A very benevolent attitude I think against an enemy which invaded their country, flooded the north part with settlers, and whose army was shooting civilians in the street when Enniskillen and Harrod's happened. If England doesn't want to be in a war, the solution is simple - remove English troops from Ireland.