The Irish invaded Britain first.
And how did Britain (actually it was the Normans who kickstarted it) invade Ireland? Because Ireland was militarily weak, as it is now.
The Irish had it coming to them. They deserved everything they got.
And yet it was Cromwell who destroyed the tyranny and Absolute Monarchy of the (Scottish) Stuart monarchs and paved the way for the Constitutional Monarchy we have today.
As for Cromwell in Scotland, the Cromwellian regime provided good governance and peace to Scotland and offered the impoverished Scots political union with much richer England - a union which would become reality in 1707 and persists to this day, and which made impoverished Scotland wealthy.
so in other words, the world needs strong military forces to protect against a British tyrant?