Earlier quoted context omitted.
There is no record of any individual being physically harmed, but the leaked diplomatic cables were highly embarrassing, hurt the interests of the US, and were completely unjustified. They weren't exposing malfeasance or war crimes. They should not have been released. Manning did it wrong, Snowden did it right.
> Manning did it wrong, Snowden did it right. AFAIK, both Manning and Snowden released large quantities of information without reviewing all of it in detail for public interest vs. potential harm, and released it not to the public but to third parties that managed public release. The difference is that Manning released it to Assange and Snowden released it to more responsible journalists.
Snowden released his information to journalists who carefully vetted each item for newsworthiness with the participation of the US government. Then that data was parceled out over many months, so it would remain in daily news cycles and continue to generate commentary over that time, staying in the public's mind.
Manning gave her data to Wikileaks, who posted it online in its entirety.