The future is unpredictable. There is no knowing what will happen to us when we step out even if it is for an everyday chore that we do in a timely and robotic manner. The uncertainty factor is always hanging there. This has increased over the years because of all the terrorist activities in the recent years. The Aurora killings have shocked the world because innocent people who were out to watch a nice movie over the weekend were killed for no reason. It is to prevent such situations that metal detectors are used.
Yes at times it can be annoying to pass through a metal detector and be grilled for carrying a nail file in your hand bag but it is also one of the most efficient ways to protect a large number of people at one time. Since a simple paper clip can also be used as a weapon nowadays it is now essential to go through the grilling process even if you accidently put the nail file in your bag. There are many different reasons for using these systems but the most important and evident reason if for security.
Sure there are times when you believe that everything is fine there are no threats to the lies of the people nearby, but that is no reason to let the security measures take a back seat. There is no knowing when a security breech may occur and if you are prepared you can be at loss.
Hand held metal detectors can be used for added security. It does not matter if the person is a VIP, if the metal detector went off, ask the person to step aside and check the person. These help in identifying and singling out the person who is a threat. That person and the device he/she is carrying can be removed immediately from the vicinity and lives can be saved.
When used in schools these metal detectors can prevent mass killings or target killings. There are times when a particular teacher or a student is targeted and metal detectors can help in identifying of a weapon is being carried to school.
Yes, metal detectors can be a hassle and yes it can be annoying to wait in line if there are a lot people waiting for entry, but all the hassle and annoyance are worth it is a potential terrorist attack can be extinguished. Schools, public events, airports and all public places require metal detectors.