There's a difference between favors and corruption, there has always been. It's something called regulations. We the people must tolerate a certain amount of favors, but there's a line: You cannot accept these favors while in office, particularly so when the exchange involves a public good or decision. You must sell your peanut farm before you hold office. You can't accept a plane from a foreign government in exchange for use of an airbase while in office. The things you do in office must be for the people. The things you do after may be immoral but they don't impact your decisions while in public service.