The British were famous for their suppression and cruelty towards the people they subjugated and the countries they conquered. They also were masters of using a portion of the people they subjugated to keep the others in line and suppressed.
Ireland's problems were not so much the British but their constant bickering and in-fighting amongst themselves that opened them up to invasion from the British Isles. Irish whiskey and informants were always the weak points of the Irish resistance against the British.
It was the British, NOT the Germans, who invented "concentration camps." Read the history of the Boer Wars in South Africa, when the British subjugated the original Dutch settlers and the native Africans, and stole their land in the latter half of the 19th century. They imprisoned the women and children of those they were fighting, and many died of starvation and sickness while in those camps - the Brits failed to give them sufficient food and medicines to deal with the appalling conditions to which they were subjected.
