But he is most critical of the lack of any apparent effort to put Bin Laden on trial for his crimes, saying the solution “has got to be law, not war” – and it is that which he describes as a “tragedy”.
He says: “There was no attempt whatsoever that I can see to arrest him, to put him on trial, to go through that process.
“This was an assassination attempt, and is yet another tragedy, upon a tragedy, upon a tragedy.
“The World Trade Center was a tragedy, the attack on Afghanistan was a tragedy, the war in Iraq was a tragedy. Tens of thousands of people have died. Torture has come back on to the world stage, been canonised virtually into law by Guantanamo and Bagram.
"Can't we learn some lessons from this? That we are just going to descend deeper and deeper…”