So if we're going with this idea of collective responsibility, I assume OP you don't mind taking the blame for hundreds of thousands of dead Iraqis.
As a matter of fact I'd say that we do all bear some responsibility for Iraq. It's not that we did it, but we picked a government that did. You can't just shrug that off and say "not my problem".
In our defence we didn't know it would happen and so I'd only really blame someone who still supported it now and claimed it was a good idea.
Of course, Muslims don't elect people to be Muslim so that doesn't quite work so as long as they don't support it now I can't blame them.
Of course anyone who went around saying the Koran was the word of god would have to take some responsibility because that encourages people to do what the book says. Just like it does with the bible.