You either blow the whistle or remain silent. Choosing to not release the material would mean he's compliant, and not a whistle blower. Which - given the details that have come to light - I judge the compliance of the individuals impeding on my rights to privacy far harsher than I judge Snowden as a whistle blower.
>If, for instance, the journalists released something irresponsible that, say, led to deaths of people
Do you think Snowden or the journalist team are more or less likely to release something irresponsibly that would lead to the deaths of people? My bets are on Snowden; had he acted alone.
Simply because as an individual he is less capable of citing/knowing which laws what is breaking, what should be released and shouldn't be released (he would have to make that call himself, rather than discussing it among others), how details may be interpreted by the public, dangers of releasing certain information, etc. I believe it would be inevitable for him to fuck up had he acted alone.
Your argument boils down to "he shouldn't have blown the whistle" and I cannot agree with that. At all.