So you have all seen those advertisements on the television for home alarm systems. You know, where the old boyfriend kicks in the door or the masked robber gets scared away by the loud alarm. I love the look on their faces when that alarm goes off. But really, what good would an alarm do if the robber was armed? How fast can the police really get there to protect you? So I would still recommend locking your doors at night because in reality that is probably just as protective as a home alarm system.