The piece does not say "never leak emails ever", the piece says "only link emails that are of civil interest", which is exactly the position that Snowden has been espousing for some time. It says "with great power comes great responsibility", not "all hackers are bad! obey the government!"
It doubly says that if we permit all leaked emails, governments could use this against us by leaking things anonymously. The suggestion here is that honoring anonymously leaked troves of emails without considering their civil merit is itself a back door around the fourth amendment. At some point the government will anonymously leak something to wikileaks and use it against a citizen. The danger here is that were the government to effectively coop wikileaks itself, which you think is anti-government, it would become a brutal and effective trojan horse. If we put blind faith in wikileaks, it will eventually be co-opted by the institutions for which it was designed to provide oversight.
This piece is a defense of your right to privacy. I'm confused as to why it's being met with such resistance here.