I think it's more of a matter of disinformation; if US citizens are radically disinformed, that's another barrier to participating in allocating our budgets. The system obviously favors decisionmaking by wealthy elites.
(Affording your own decent healthcare is enough of a feat in the US, that if you're wealthy enough to chip in for some of other people's healthcare too, people think you must be Batman or something.)
As for Bill Gates in particular, apparently one problem is his support for intellectual property, though his foundation. Many consider IP (particularly patents) a major problem for world health; and certainly the US knew better than to respect other countries' intellectual property, while it was developing. (To Charles Dickens' consternation.) (http://keionline.org/microsoft-timeline)
(Affording your own decent healthcare is enough of a feat in the US, that if you're wealthy enough to chip in for some of other people's healthcare too, people think you must be Batman or something.)
As for Bill Gates in particular, apparently one problem is his support for intellectual property, though his foundation. Many consider IP (particularly patents) a major problem for world health; and certainly the US knew better than to respect other countries' intellectual property, while it was developing. (To Charles Dickens' consternation.) (http://keionline.org/microsoft-timeline)