Pretty sure that as bad as the Troubles undoubtedly were, there weren't entire towns in Ireland that got
attacked with nerve gas and reduced to rubble with mass artillery strikes and aerial bombardment.
You're not comparing like with like. The Syrian conflict is of a much greater magnitude and intensity than the Troubles were. ~50,000 casualties vs 367,965 to 560,000. Not to mention Turkey, Russia, the Saudis, the US etc all sticking their oars in and stirring the pot.
Against such a brutalising background it's hardly surprising that
great atrocities are committed. What happened during the Troubles to match that?