Half an hour can last forever

Thirty minutes. That is how long the shooter in DC had to kill before police caught up with him. It was seven minutes before the first cops even entered the building. This is not a criticism of police, it's just that they cannot be everywhere. I feel like they did what they could, and did it well. You are responsible for protecting yourself and your loved ones. Own a gun, and learn how to use it. Thirty minutes can be the rest of your life.