I will be quoting a some excerpts from the article which I find are enlightening.
Like any journalist, I am a fervent believer in freedom of information. But I also believe governments should have secrets – and also secretive methods of finding out what is going on over the horizon. That’s what intelligence is for: to protect citizens against unpleasant surprises.
This hits the sweet spot. There’s always spying going on between countries, and there’s no need to “over-publicise” the fact that it actually happens. Look at what happened between Indonesia and Australia. The vicious backlash from Indonesia is kinda overboard in my opinion. The ex-spy chief of Indonesia stated himself that it is natural for countries to spy on each other. It isn’t like Indonesia doesn’t do any spying on its own.
Snowden, Assange and Manning are more information anarchists than whistle-blowers, the products of the Internet generation, which shares the naive conviction that citizens should know everything their governments do. It does not seem to matter to them that too much public knowledge of official secrets puts their governments at a disadvantage to states such as China and Russia, where free flow of information is not encouraged and can often lead to draconian espionage charges.
Another paragraph which sums it all up very nicely.
After saying all that, I am not fully against what Snowden is doing, what he has bravely done definitely goes a long way in enshrining the privacy of the general populace. However, the information which he chooses to release could be given a little more thought. Well, I acknowledge that it is easy to say since I am not in his position, but yeah, it is a tight rope he is walking on.