@derxa I'm assuming the reason it came up in the interview was that the interviewer asked Neeson (who is playing the role of a man who seeks revenge against the drug dealers who he THINKS killed his son) if he could in any way understand or relate to the character. And Neeson told what he did. Interestingly, the full transcript of the interview does reveal that he relates this back to the Troubles as previous posters surmised (although that bit was left out of most of the reporting):
"I eventually thought, 'What the f**k are you doing?' Y'know?
"And I come from a society - I grew up in Northern Ireland in the Troubles - and that, y'know, I, I knew a couple of guys that died on hunger strike and I had acquaintances who were very caught up in the Troubles, and I understand that need for revenge. But it just leads to more revenge and more killing, and more killing, y'know?
"Northern Ireland's proof of that, y'know? All this stuff that's happening in the world, the violence, is proof of that, y'know?"