You guys fail to mention why they were standing around for two hours.

When you find two dead bodies, one of a girl and one of a guy, the most common killer is the girls boyfriend. Thinking this, they called the girls roommate and found out that not only did her boyfriend have guns, he had taken them on a hunting trip not long ago. They then spent the next amount of time finding the boyfriend, only to find out his guns were at his parents house in boston.

The point is that they didn't even know there was someone still out there with a gun. All of the logical evidence pointed to the boyfriend in that two hour period.