The question raises issues of causality as well as the implication of accountability. The two issues are different, and we need to take care not to conflate them. Clearly, in an interconnected world, any action will have an influence on the actions, and 'attitudes,' of others. No doubt we did things which pissed off islamic radicals. This in no way implies these actions were illegitimate or shouldn't have been taken. These people objectively are primitive savages who fly into rages at the most ridiculous of offenses. We "contribute" to their attitudes, for example, by being a Judeo-Christian "infidel" nation. They erupted in murder and violence over a set of cartoons. Most anything we do is going to be twisted into some casus belli for the jihadis.
Having said that, I also do not think this question is as important as you apparently do. The fat's in the fire, and the most important question is what to do now to beat the enemy into submission. Pawing over the past won't put the genie back in the bottle, nor will it help us ever discover a way to cajole the enemy out of his culture of death.