I've only been through that CBS link, but it's almost comically awful; a good reminder of why you should avoid nearly every story about a complex issue from a media outlet. As a representative line:

"Mayors in 29 cities say more than 1 in 4 people needing emergency food assistance did not receive it."

But at any rate, you completely misunderstood the parent's comment, which alludes to the fact that any American with enough disposable income to be browsing HN is in a rarified stratum of wealth globally, and has plenty of opportunity to donate it to the less fortunate.