Maybe, I am staggered by the implication that a country can be at war for 10 years based on an assumption for which it cannot even provide sufficient evidence to convince its own courts.
What's staggering about that? The entire reason such a court case can't be built, is exactly that said country made an explicit decision to pursue the issue as a matter of war, and not as a matter of law enforcement.
If the USA had been working to bring Bin Laden to trial all these years, the story would be very different.
But yeah, I believe that a person is presumed innocent until proven guilty.
A problematic standard outside of an actual courtroom, or similar setting. Since there is no particular process for producing evidence or otherwise proving anything to you - nor any visible way of ensuring that your doubts are reasonable - you must presume that everyone everywhere is innocent, forever.
Unless you can eludicate some practically useful standard of "proof," that is. But I don't think you can.