Why shouldn't they? Again, you're positing a conclusion with absolutely nothing to support it.
They haven't earned it.
So?
I don't quite understand how you perceive it as fair, but again, the issue is completely subjective.
Indeed it is. Every issue involving politics is completely subjective.
It's fair because somewhere along the line they had an ancestor who worked hard enough that his family line wouldn't have to work. Indeed, that's part of the American Dream. If I was, say, Bill Gates rich, I wouldn't expect my children to necessarily have to work (though I'd probably encourage it anyway, for the character it builds); and if I had enough money that my descendants could be supported indefinitely, I would expect it to happen.
Is it unfair when somebody doesn't have to work because they won the lottery? Or hit a jackpot at the casino?
There is no hard and fast rule that you need to work to have money, nor should there be. Luck is a part of life.
Anyway, I'm apathetic regarding this point, as it wasn't me who brought it up.
Well, you started arguing it. But that's okay; the point was entirely irrelevant to my initial statement that started the discussion, anyway, so frankly I'm a bit apathetic about it too.