1. 安装监视器的优点：

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　　利用监视器可以帮助警察catch criminals, thus reducing crime. a camera is more fective than security guards. 警察和保安不可能全天24小时工作，而camera will not feel tired.而且它更objective, sometimes our eyes might deceive us, while a machine can exactly record what happens, it can prevent much unnecessary embarrassment. Frighten off the criminals and reduce potential crime.

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　　2. 缺点：

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　　Critiques about installation of surveillance typically look at the infringement of people’s privacy.

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　　Being photographed and recorded by the camera,很多人feel uncomfortable and no privacy.特别是女性，有些人可能会将camera获得的资料用于illegal use.

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　　3. 尽管有缺点，但是为了public safety ， 监视器是有必要的。但是应该尽可能balance the need for security with respect for individual’s privacy and freedom.

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