Exaclee. The guiding principle for the relationship between the state and the individual should be 'feck off and leave us alone, unless it is necessary'. Is their aim legitimate? Probably, is this the least intrusive way of doing it, is it feck?! If you have a case, then get a warrant, if you don't, get a case.
And this 'I have nothing to hide' is a load of shite too! You may not have raped or murdered anyone, but everyone has things they want to hide, if for nothing else than everybody needs something that is theirs, and secret, even if in reality it is minor and inconsequential. Do you want everyone knowing what you last had a wank to? Look everyone, lets 'share' our toilet habits. I can't wait for the day you walk down the street and the billboards scan your credit card (or more likely smartphone as we wont need cards anymore) and alter their advert to address your buying history. There are plenty reasons to resist the constant assault on personal liberties of the snoopers with vested interests in keeping us all terrified without needing to resort to George Orwell.
We've seen in the last couple of years there are certain commercial relationships that exist between the police and outside business. If News of the World can buy other information, what makes us think this sort of thing won't be up for sale. Companies like Facebook track you all over the internet and then sell where you have been to advertising companies. At present there is only so much information they can get their hands on, and the vast majority of that, even if people don't want to, is freely offered for them to have a go at taking. If NOTW can buy information, what makes people think the content of our emails wouldn't be up for sale?
That assumes that continuing duplicitous nature of certain sections of the police, but even with a perfectly honest police force, the potential for trouble is high. Remember the early 2000's where every other week there was a news story about some civil servant leaving a laptop on a train containing all the nuclear codes, or the bank details of everyone in Kent.
The commercial ramifications from the potential for identity fraud are frickening! I wouldn't like to think how much it costs banks every year, given they tend to take the brunt for most if it. It happened to me and they were fantastic, sending me a cheque for the couple of hundred quid within two weeks. I'm less sure they would be as accommodating if it were costing them ten times as much.
People who want to keep the content of their personal conversations via email private do not need to justify why. It is the people who want to disregard that privacy who need to justify it. Hence the need to go before a judge and get a warrant.
Those who would give up essential liberty to purchase temporary safety deserve neither liberty nor safety.
totally in your corner W4E this is just another step towards communist britain and another step to world communisim.