Archangel did not seek them out. She merely found them, and stuck to her mission objective. What would you have done, if you came across them? Betray your mission? Delegate the task to someone else? Eagle Squad are harden killers. Be it super mutants or babies, if we are told to kill someone, we are expected to have the ability and means to do so. Besides, I never liked the kids in the Fallout Games, cept maybe the boomers. Everyone else was a pain in the ass that I couldn't melt with my laser rifle.