One week ago, Tamerlan and Dzhokhar Tsarnaev killed a police officer, engaged in a massive shootout that wounded another and left Tamerlan dead, and set off a manhunt that put Boston on lockdown. Many of the initial reports were a confused jumble, and we're only now able to recreate the Tsarnaevs' movements and actions on that final day with any precision.
The picture that emerges from reports by both local and national media, and from the criminal complaint filed against Dzhokhar, does not suggest a pair of experienced criminals executing a master plan. It shows disorganization—a police officer murdered for his gun (the brothers had only one), a vague idea of exploding more devices in New York City, and a meandering drive in and around Boston that couldn't help but alert authorities. In short, two scared, unprepared, and dangerous young men.