Originally Posted by dhuey
If one wants to target those folks on the streets, they can just attack in the morning or afternoon rush hours. The high value targets, so to speak, aren't heading on to the streets as a group. They're either going into a shelter or dispersing widely outside.
In the previous evacuation, the Congresspeople (let's assume they're "high value") were evacuating through the same routes and exits as their staffers were.
In the morning rush hour there's no way to guarantee that any significant number of "high value" targets will be outside the buildings at any given time. This significantly increases your odds.