Wow! What a cunt.
Maybe I am too eager to give the benefit of the doubt, but I took his statement as a conditional one. Basically
"IF the USA is a terrorist then terrorising the terrorist is a good thing, but I don't even know if Bin Laden is doing that"
So if Bin Laden is fighting an enemy of Islam then it is a good thing, but considering he also says he doesn't know IF Bin Laden is doing what the USA claim or exactly what Bin Laden is doing (if anything) he obviously cannot comment on individual actions.
I am not excusing him, I think he slipped up, but I am not certain he meant exactly what it appears he said.