well that depends upon how you fit the definition for scapegoat for a person or an entity. The US Secretary of State Hillary Clinton had remarks about wikileaks as "this disclosure is not just an attack on America's foreign policy interests, it is an attack on the international community."
When the Secretary of State herself is blaming and criticizing others for the damages done, how can Hillary Clinton be a scapegoat? She never admitted the blame of wikileaks on her shoulders. Furthermore an interesting aspect can be seen here that Julian Assange was NOT the SINGLE ONLY perosn who had access to the leaked documents. After all there were the volunteers as well who had some sort of access to the diplomatic cables. This translates to the bigger picture of having connections of these volunteers and Assange within the State Department who helped him release the diplomatic cables on the internet. In short, some government employees had confirmed conspiracy against the US government. Along with Assange, they should be brought to justice as well.