And think of all the murderers who can't be caught because the walls of private homes absorb the sound waves rather than recording them and sending them to the

And think of all the murderers who can't be caught because the walls of private homes absorb the sound waves rather than recording them and sending them to the government. But seriously, governments are supposed to enforce laws to preserve the rights of people to be free, not strip away the rights to enforce the laws. People's freedom is primal, privacy is an important part of freedom (it means you can do lawful activities without fear of repercussions, either from governments abusing their power, or criminal groups which have used the same systems), and so violating people's privacy to increase crime detection rates is a bit like rigging your house with dynamite to stop vandals. Even if you trust your government and ISP employees, strong physical and computer security is hard, ISP data retention systems are complex, and if the data is retained, sufficiently motivated criminal groups can get access to it easily.