In Their Own Words...
This documentary is a bit of a let down. It obfuscates many facts and from reading the posts has apparently brought about great confusion. I've read posts praising the WU's activism but then decrying the statements from members saying they would 'do it again'.
The confusion stemming from the fact that the WU did not accomplish any demonstrable end from their terrorist activities in ending the Vietnam War. Of course that makes a lot of sense since the Weather Underground conducted the vast majority of its operations in the early '70s, and after the Vietnam War had already come to an end.
To bring a little light on the subject, I've linked below a copy of Prairie Fire, the manifesto of the Weather Underground (it is being hosted on a conservative blog, but I don't know for how long so grab it while you can) detailing their ideology which isn't precisely a doctrine that advocates pacifism and an end to War, but an end to War against communist forces and the defeat of western liberalism on communism's behalf.
http://site2.littlegreenfootballs.com/pdf/Prairie-fire.pdf