[grand wazoo]

Its OK to commit genocide (your word) against "nomadic tribes"?

I never said that it was! You are the one trying to justify the attempted genocide of the Irish by the English by ignorantly accusing Americans of the same thing. Read a history book.

the Celtic Irish were, well into Tudor times, largely a herding people

Nonsense. The Irish had farms and raised cattle. Very different from following the migrations of the buffalo.

From a Wikipedia entry about Ireland At the Céide Fields, preserved beneath a blanket of peat in present-day County Mayo, is an extensive field system, arguably the oldest in the world, dating from not long after this period. Consisting of small divisions separated by dry-stone walls, the fields were farmed for several centuries between 3,500 and 3,000 BC. Wheat and barley were the principal crops.

You are a total moron.

[Pilsner]

Found a Wikipedia entry about fields in Ireland in 3,500 BC did you? Good for you. Why don't you go back and read a bit further into the same article The Celts were commonly thought to have colonised Ireland in a series of invasions between the 8th and 1st centuries BC. So those fields weren't farmed by the Celts, but by the people the Celts exterminated when they invaded Ireland.

Yes, the Celtic Irish did some farming, but the the man in the street, err, bog, was far more likely to be a herdsman. The farms (monastic communities, perhaps, excepted) tended to be clustered around the port cities nearest England, or around the seats of Viking and later Norman Lords. Farmer was a low social position to the Celts, who aspired to be warriors, bards or brehons (judges).

Farmers were more valued by foreign invaders, as they were easier to exploit. A herdsman who has taken his flock, and family, twenty miles up into the hills, to an ill defined summer pasture, can, unless watched constantly by armed men, vanish with all his kin and belongings. A farmer has far less ability to stuff his oat crop into a sack and disappear with it. The farmer, and the fruits of his labor, will be easy to find when the new foreign lord's tax/rent collectors show up. The herdsman, not so much. Farming, far from being what the Celts preferred, is what they were forced to, by the destruction of their society, by the Vikings, Normans, English and Lowland Scots.

Of course, given that you have posted that following herds is so useless an existance that it justifies a farming people in exterminating the herders, in order to take their land, I hardly expect you to admit my point.