No-one here in Britain feels guilt about the "Irish Genocide", any more than Israelis feel guilt about the "Gaza Genocide".
This is because (like the mass killing of the Palestinians we read so much about in the quality papers) this putative mass extermination of the Irish people has never happened, except in the fevered brains of NORAID apologists. Indeed, NORAID and its ignorant supporters have blood on their hands for ever suggesting such a thing.
And I agree, there was never any "genocide". Some wrong-headed government policies by people honestly trying to help, and some foolish nationalists who also honestly were trying to do the right thing. And a sprinkling of malicious people on both sides just to aggravate everyone. But no genocide.
I can understand wh the Brits would not feel guilty. They never do.