All ideas which can make us safer or stop crime, have good sounding reasons for their need.
For instance, why not put government cameras in all homes to stop or prevent child and wife beating, or other crimes? Here's some of the reasoning/questions they'll ask - "Do you not care about children who're abused? Do you not want to stop crimes? We now have the technology to stop crimes before they occur, why would you be against that? What do you have to hide"?
These arguments always work in support of a police state. Of course they ignore the threat that a police state is to our liberty.
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