America enjoys a reputation of being a rather non-corrupt country. To large degree, this is true: bribing scandals are rare, and most Americans would be completely aghast at the idea of passing an envelope under the table to the official who is responsible for issuing building permits.
Instead, the corruption in the US operates through completely transparent and legal means. Instead of cash-filled envelopes, you see campaign contributions, board seats, consulting jobs for children, and, yes, donations to designated causes. All of this is just How Things Are Done, and people are so used to them that they no longer even consider it corruption.