His actions were far from the sole cause, but they certainly contributed. The chain of causality being that he created Wikileaks and solicited releases of confidential US information. The confidential US cables then became public. The information in those cables helped start civil wars.

This may seem tenuous, but it was pretty much what he was hoping for. http://web.archive.org/web/20070129125831/http://iq.org/cons... describes what Assange hoped Wikileaks would accomplish before it had accomplished anything. Said purpose was to make it harder to maintain authoritarian conspiracies.

Given that, the fact that his actions caused trouble for authoritarian conspiracies in the Middle-East is an intended consequence.