Secondly, not falling into poverty in the first place really is a question of help. Wealthy people (read: almost all HN users) have networks of wealthy people to assist them when times get hard -- parents, children, siblings, friends.
The poor do not. Poor folks have networks of other poor folks. If I lose my job and my house, I have a year of cash and goodwill to live on, couch-surfing and stretching savings. If a member of the working poor suffers a setback on the way out of poverty, he could be back to square one, or worse, in a matter of weeks.