The trauma of it still exists in our collective memory and DNA. Through the generations our minds and bodies have been completely shaped by it. For example the rates of Haemochromatosis in Ireland are still much higher than in other European countries:
https://www.irishamerica.com/2013/08/the-great-hunger-and-the-celitc-gene/

The population before the famine was 8 million and continued to plummet after it until well into the 20th century due to mass-emigration, reaching as low as 2.8 million in the Republic in 1961.
The devestation on our language, culture and psyche is unprecedented in modern Europe and more akin to the destruction wrought on Indigenous societies of the Americas and Australia. That's why the Irish feel such an affinity with the Palestinians and even many of those not usually considered 'political' are horrified at what is being done to them and take to the streets. The pain is exacerbated by the fact that we haven't fully undergone our own process of decolonisation.