Manning was very sloppy; that's true. But she also released very important information about war crimes. The intent was good, the execution was bad.
As for the Arab Spring, you can blame it for revolutions in Tunisia, Libya and Egypt (some good, some bad), but I don't think Syria has anything to do with it. And ISIS was the direct result of the US invasion of Iraq.
Without being mind readers all we can know is what Manning claimed about intentions. People who break their oaths aren’t the most trustworthy cohort. Regardless, good intentions do not absolve anyone from high crimes and precipitating mass murder.
> ISIS was the direct result of the US invasion of Iraq
Without weakened or destroyed regimes across the region due to Manning’s actions there wouldn’t have been as much freedom for ISIS to spread. Manning shares the blame.
As for the Arab Spring, you can blame it for revolutions in Tunisia, Libya and Egypt (some good, some bad), but I don't think Syria has anything to do with it. And ISIS was the direct result of the US invasion of Iraq.