I was working at a defense contractor in 2010 when the big leak of all the cables occurred, and was forced to learn a lot of things I wouldn't have otherwise, including something that maybe a lot of people don't fully grasp:
When stuff like this leaks, if any of the information is considered sensitive/classified/restricted in any manner, the act of it being leaked does not dissolve its restricted status. In other words, if you are a regular US citizen and you go to Wikileaks and look at something that is classified without having the proper security clearance, then you're now on the wrong side of the law.
I don't think there's any political shadiness going on here, I think Google is just trying to be on the correct side of the system. Whether or not that system is on the right side of some moral or ethical line is a different conversation entirely.