Let's say for a minute that you were to fall ill. Nothing too serious, just enough to keep you under the weather and maybe push you to go towards the doctor. You make up your mind and decide to go in for a visit, but along the way a family member calls you up and offers you some of their own medications to try and help you out. Obviously this is a poor idea- everyone's body is different and what works for them will probably not work just as well for you. You go ahead and go in to see the physician.
Once you have actually managed to see the doctor you find yourself dealing with a problem. This particular physician has plenty of patients and, as such, is either unwilling or unable to dedicate the time and resources that each of his patients deserves. You end up having to match your symptoms against a list and get a generic diagnosis and met with a round of medication that may or may not treat what ills you. So far you have medication from a family member that may or may not work and a list of prescriptions from a physician that does not have everything you need but includes many items that you probably don't.
Obviously this is a scenario that is not going to end very well. You would not trust your health to these people, so why trust your safety to them? It is absolutely necessary that you have the right security system to make sure that you remain safe. What is good for your neighbor may not be good for you! Every single home and piece of property has different properties; trying to treat one exactly the same way that you treat another is just a recipe for disaster and heartbreak.
Your home security system is more than just a box that wails whenever someone tries to break into your home. It summons emergency personnel whenever your family is in danger. Depending on the system, it can detect fire, Carbon Monoxide poisoning, or any other number of silent killers. It can be equipped so that you can keep an eye on your home remotely at all times. Your system can be modified to do just about whatever you need- this is why it's so important that you find just the right security system for your home.