He actually talk about it for little bit here:
Bono is a face and voice of radical ideas, the kind of rock dreamer not seen since Lennon. Hanging outside the hotel, I can see a few likely characters who might love, or hate, Bono so much they want to make him a martyr, or absorb some of his power by destroying him. Does he ever fear for his safety?
'Every so often something comes up and you have to be a little bit careful. I don't really have any fear in me on that level. I'm not going to take silly chances, but I suppose I don't really think about it. For such speechifying maybe I deserve not to be shot but to be clipped around the ear. Nothing more than rotten eggs, perhaps. I don't think my crimes are punishable by a bullet.'
Again, I HOPE AND PRAY THAT HE IS RIGHT. NO ONE SHOULD EVER DO ANYTHING LIKE THAT. IF THEY DO, I WILL HUNT THEM DOWN AND GIVE THEM WHAT THEY DESERVE!!!!!!!!!!!!!!!!!!!!!!!!1