Destroying the hard drives was an exercise in dominance, 'do as we say or face the consequences' which had no impact (aside from inconvenience and the cost of a couple of Macbook Pros) to The Guardian but has made the UK .gov look foolish.
Pulling Miranda, abusing the terrorism laws, sending a message is another dominance play but it's back fired awfully. Brazil is annoyed, GG is annoyed, America has calmly washed it's hands and said "leave us out of it". In terms of strategic decisions it can't be described as an excellent one. What's the UK .gov gotten out of it? Some encrypted data and social network passwords, it's not a win.
If you're in the UK and you think this is unacceptable for our government to be trying to intimidate the journalists who're revealing the uncomfortable level of surveillance we now live under, and what the security apparatus has become, then write to your MP. That's what they're there for. We can't just hope that it'll surge through the halls of Parliament, we need to be heard that we think it's not acceptable and not representative of what we want Britain to be.