I agree the first line is a fairly provocative statement and a tough one to get my head around, but I can see how the immediate and intense focus on re-building would be a more powerful request to the Universe than the one you would be sending out if you had returned that night to a home that was still standing. And I suppose, not having a house would lead to all kinds of new and unexpected adventures...staying at other peoples' houses...meeting new people. Experiencing the kindness of others. It could lead you to a new job... a new lover... or perhaps even a totally new life!
But in order for that to happen, the powerful desire has to be established first. And this is hard to do whilst enjoying a TV dinner with your feet up in your favourite chair :)