I'd like to kill those eyes and ears of my enemy, but they're not in system long enough to hurt. How can you kill scouts, particularly in the early game when you don't have interdictor technology. Even with it, I'd be hard pressed to kill one in time without a 1/2 dozen frigates waiting at it's incoming jump point.
Scouting is a common 4x need. It's always common that scouts are on suicide missions to gather intelligence. In Sins, scouts have a very impressive survival rate. A bit too impressive!