7 years after 9/11, half the world DOESN'T think al queada was responsible.

I found this graphic on the Gene Expression blog (and I don't know why they went so off-topic), but I was stunned to see the story that this chart tells:



Look at the bottom line: only 46% of respondents believe that al Queada was responsible for 9/11.

Two thoughts:
1) we've lost a lot of credibility. (Obviously)
2) while I've certainly seen the case against Bin Laden/al Queada on the nightly news, has the case ever been made in a more formal, larger setting like the UN? Have charges against Bin Laden even been filed? A grand jury seated? A quick check around the internet says no. Why?