From a legal and moral perspective, even if your original intention is to prevent and stop crime, if you collect and analyze personal information without the explicit consent of individuals, this may still constitute an infringement of personal privacy rights, thereby triggering legal and moral responsibilities. 1. Legal responsibilities: • Many countries and regions have laws on data protection and personal privacy (such as China's "Personal Information Protection Law", etc.), which usually require data collectors to obtain the explicit consent of the parties or meet another legal basis stipulated by the law. • If you collect and process personal information without authorization, even if the purpose is for public safety, it may be deemed to be illegal acquisition, use, and dissemination of personal data. This may result in administrative penalties, civil compensation, and even criminal liability. • Some countries may have certain exceptions in sensitive areas such as security, but these exceptions usually require strict procedures, clear legal authorization, and a reasonable balance of rights. If personal data is still directly manipulated without legal procedures and authorization, it is easy to touch the legal red line. 2. Moral responsibilities: • Personal privacy is a basic right, and even if it is sacrificed for public safety, it needs to be carefully weighed to prevent abuse of power or infringement of civil liberties. • From an ethical perspective, invading privacy without consent may undermine the public's trust in social justice and the rule of law, and may also trigger ethical disputes: Can the public interest be achieved at the expense of individual rights? • Unless there is a good reason to temporarily ignore personal privacy in special circumstances (such as authorized by legal procedures in an emergency), this practice is usually morally condemned. 3. Comprehensive considerations: Even if crime prevention is justified, the means must still comply with legal provisions and ethical norms. Existing data protection regulations and ethical principles are all aimed at striking a balance between protecting public safety and respecting individual rights. You should strictly abide by existing legal provisions and ensure that any behavior involving personal data has a clear legal basis or has been fully agreed to by the parties involved. Otherwise, in the process of pursuing public interests, individuals' privacy violations will still be subject to corresponding legal and moral responsibilities. In summary, if you collect and analyze personal information without legal authorization or informed consent, you may indeed need to bear corresponding legal responsibilities and be questioned ethically. Therefore, when using big data analysis technology for crime prevention, you should ensure compliance with laws and regulations, attach importance to the protection of personal privacy rights, and find a reasonable balance between public safety and individual rights.