Yes, good point. I should have noted the effect of the Potato Famine on Irish thinking. The UK is bad. So an enemy of the UK (Germany) is perhaps not so bad.
And I agree with you. The Potato Famine was genocide.
That was one of the biggest points of propaganda to incite hatred against the British, even taught in schools. I disagree it was genocide. Much of the worst of the problems were inflicted by Irish on fellow Irish.
Another talking point for anti-British sentiment is Oliver Cromwell and his siege of Drogheda.