Big Government means small citizens: it corrodes the integrity of a people, catastrophically. Within living memory, the city in flames on our TV screens every night governed a fifth of the Earth's surface and a quarter of its population. When you're imperialists on that scale, there are bound to be a few mishaps along the way. But nothing the British Empire did to its subject peoples has been as total and catastrophic as what a post-great Britain did to its own.
Update: Theodore Dalrymple adds his tuppence worth.