It is hard to deny that video cameras set in public places sometimes explode privacy, such a fact leads impressionable people to generate the opinion that installing them is not a good way to reduce crime. However, such a statement suffers from both logical and factual fallacies, and it should be examined meticulously. As far as effectiveness, technology and economy are concerned, I strongly hold the idea that installing CCTV cameras is the wisest approach to prevent crimes from happening.