Rwanda is an astonishing country: safe, prosperous, orderly, and open. Its success is remarkable enough given the rough neighborhood in which it finds itself. But when you think that 30 years ago this month, it was in the throes of the worst mass slaughter of the late 20th century, its achievements look miraculous.

I have been thinking a lot about Rwanda, partly because of the grisly anniversary of the genocide and partly because Britain is having an almighty hoo-ha about sending illegal immigrants there. Our courts ruled that Rwanda was an unsafe destination — not because it was itself dangerous but because it might send deportees on to third countries. This strikes me as an objection to ever deporting anyone anywhere, but that’s the British judiciary for you.