If I budgeted $100 for charity work and I decided saving birds was the best use of my money then I would just give the whole hundred. If I later hear more birds need saving, I will feel bad. But I won't give more.
Suppose you budgeted $100 for charity, and then found out that all charities were useless - they just spent the money on cars for kleptocrats. Would you still donate the money to charity?
Probably not - because hearing that charity is less effective than you had thought reduces the amount you spend on it. Equally, hearing it is more effective should increase the amount you spend on it.
This principle is refered to as the Law of Equi-Marginal Returns.
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