This is an iterative process. Yes, GlobaLeaks could be used to spread fake leaks, but then it will force all democratic processes to be more transparent, in order to efficiently prove or disprove leak L or new N.
How fast we can prove a piece of fact is the next step, but to get there, you have to give people the tools to spread information (true and fake) as much as possible, imho
Edit : Also, this initiative is European. If you don't trust your own intelligence services, stop whining about it and come live in Europe?
Someone else gave the Pentagon papers as an example of a "good leak" and it was. But I think good leaks tend to be those, like the pentagon papers that are handled by responsible organizations (NY Times and Wash. Post in that case). The people who created this code may be just such people, but there's no reason to think someone who does git-clone on this repo is.
By the way, both the Post and the Times openly solicit leaks.
The method of leaking has little to do with the value of the leak, someone will print almost anything. The Times and the Post regularly print items intentionally leaked for propaganda purposes, the classic example is the buildup to the Iraq War.
Sure Russia could be behind the DNC leak, but so could a 14 year old who guessed that podesta's password was password (if you believe Julian Assange's claims which haven't been denied by the DNC). It could also be a disgruntled Democratic party staffer who saw what Hillary and Podesta were like behind the scenes and said "fuck these people, the public needs to know what they're really like"
Second, why is it a bad thing that Hillary's email was leaked? It gave an insight into how corrupt the Democratic party is and how corrupt our politicians are and how the democratic process is being rigged. This is a lady who ran a private email server as secretary of state. I'm happy that we were able to find out how the Democratic party rigged the campaign against Sanders and worked a little too closely with the media to ensure a Hillary victory. I'm also glad we found out the real reason for the attacks on Libya (gold reserves not protection of people).
Sure it had a bad result for Trump opponents who didn't want Trump to win. But imagine it was not Trump but Obama running against Hillary and the emails had been leaked. I'm sure you and everyone else would be saying that it was a great moment for democracy instead of regarding it as a terrible mockery.