When the crime rate falls, tough sentences are hailed as the cause, even when demography or other factors may matter more; when the rate rises tough sentences are demanded to solve the problem.

当犯罪率下降的时候，法律惩治严厉便成了下降的原因迎得欢呼，哪怕是人口或是其他因素对犯罪率下降的影响更大，如果犯罪率上升了，就要严厉的惩治措施来解决问题。

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But did you also know that urban crime rises in the summer, as well?

FORBES: News Flash

However, these concurrent changes could support either of two hypotheses: that crime rises when individuals own more guns, or that individuals purchase more guns to defend themselves against rising crime.

ECONOMIST: Economics focus

So when crime rises, better to create another criminal offence and we've had over 3000 new ones since 1997, than it is to take the long-term action that would strengthen families.

BBC: Cameron's data speech in full