They don't. The numbers don't back that up. For example look at people pouring out of Syria. 3.6m in Turkey, 2.5m Saudi, 2.2m Lebanon, 1.3m Jordan, 600K Germany, 242K UAE, 230K Iraq, Kuwait 155K, Egypt 118K, Sweden 110K, Sudan 100K, Yemen 100K. Its a long way down the list to the UK with 9K...