"There's an easy way to explain it," Lena said. "There's a reason when you join the Agency one of the things top of the list of do nots is "Don't kill Hitler". Not because the Agency has any love for Hitler but because killing him might fix one problem but most likely it would simply trigger a whole set of other difficulites which weren't there before. Sure, they could go kill someone but it'd be too easy for us to trace it, it'd be the first cause we'd look for. On the other hand we could easily miss someone escaping death, especially someone like the US President. If we want to find out what Creighton's doing Dallas 1963 seems as good a place as any to start, at least its the only lead we have right now."