That is ridiculously contrived, and would probably have handed the debate to VofR if you and Imm were the only people arguing against him.

However RichardKennaway has already given the real answer: They are opportunity seekers in the last leg of their journey, but their starting point in that search is various refugee camps in Turkey and the middle east, to which they fled from war and other real dangers. If you look at the demographics in the refugee camps they look much more like whole families fleeing together.

Additionally, if one person in a family gets papers to stay legally in any EU country, the rest of the family gets to come here on regular flights with proper visas, which is both safer and cheaper then the boats that the asylum seekers arrive on.