‘Somalis All Over’

John Derbyshire, on the flow of Somalis to the West:
‘..Here’s one: Mr. Saeed Khaliif. I should actually have said “here’s ten,” as Mr. Khaliif has a wife and eight children. (Though eight is only our best estimate. No one seems to know the exact number.)
The Khaliifs arrived in Britain three years ago as refugees from Somalia. In their three years of residence, neither has had paid employment, nor have they learned to speak English. What they have mainly spent their time doing is gaming Britain’s welfare system. Most recently they have moved into a seven-bedroom house in tony West Hampstead—Emma Thompson lives nearby. The house is worth $3.2 million. Monthly rent—paid for by British taxpayers—is $13,000…’
Wabbit has just one question:
WHY?