Who protected Bin Laden in Pakistan? We don't know. Any government turns out to have murky ideas as far as terrorists are concerned. If you doubt that, look at the history of the U.S.A. with colonel Khadafi. Is it clear to you? What strikes me is that Bin Laden did not have a large force to protect him; he counted on anonymity rather than on the government. It is interesting. He probably had some protection, but not full support.
By contrast, I clearly remember the French village where the Ayatollah Khomeini took refuge in 1979: it was peppered with security officers from the Gendarmerie Nationale. They always had a police bus in front of the compound. Not only the protection was official, but you could see high antennas on the roof of the property: it was before the time of the Internet; Khomeini sent his messages by radio all over the Arab world, with the full complicity of the French. Murky, murky, and we have been in trouble ever since.
And how come the multi-million dollar reward offer had no effect? As I am very old and I have traveled a lot, I can tell you this: there is one very greedy person on every block of every town all over the world. No exception. Somebody sold Jesus, remember? Treason during World War 2 was common. What about Bin Laden?
There is something that we have not done right. I guess a lot of people would have liked the money and feared retribution: they wanted to stay home and enjoy the money, they did not want to emigrate here under our protection to enjoy it. Our reward program abroad has to be modified: logic tells me it should have worked better than that.