And I think Hermione would say that they should have supported the war with the money they could give. It was wrong for them not to do so, but not as wrong as QuirrellHero refusing to what he could do, since he could do so much more.

I'm not entirely confident on my projection of Hermione's argument, but I still think her response is "an answer to Quirrell's question" regardless of how I interpret it, which was the original point.