Those that are less fortunate aren't also the ones that make it possible for me to earn a living. Police, teachers, firemen, road workers and some others do all that, work hard at it, and I appreciate their contribution. They're not the ones we're talking about here.
That's an excessive over-simplification of my point. And to answer you: no, he doesn't become "worthless" to me (whatever that may mean), but I will stop paying him for his services.
The fact is that the healthiest situation for any society is for every member to be able to afford to meet their basic needs with a little extra income. This is clearly not possible through a purely free job market. 'Sacrificing' some of your income to maintain this society and permit mobility is in your best interests. Who's to say you won't be the next one fired, or your child?
