Back in the great days of Iain Dale's blog, an axe murderer freed from prison used to hang around online like a very unpleasant and particularly unwelcome bladder infection. Everyone hated him and he was subject to suitably offensive comments. However, given that one of the reasons he bludgeoned his landlady to death in the first place was because he craved attention, I'm not sure how successful the strategy was. The consensus seemed to be that he should never have been released.
Europe doesn't like our whole-life sentences for the most heinous of murders; the sentencing of Lee Rigby's killers, prime candidates for whole-life terms, is on hold pending a resolution of the issue. Officially, we just have one sentence for murder - life - but this is modified with a recommendation defining what 'life' should mean. In some cases it means seven years.
We have neither evolved different 'degrees' of murder as distinct criminal charges nor jail terms in excess of a hundred years, as have been long used in the US. Europe believes all murderers are redeemable, though I suspect that few EU Commissioners or ECHR judges would be happy to live next to one. They want to see even Lee Rigby's killers enjoying the prospect of release. We mostly disagree.
As the matter must be resolved before Rigby's killers are disposed of - postponing sentencing too long will undoubtedly violate their European Rights - this will be a good test of Cameron's true resolve.