[Rip tilts his head briefly back and forth when Killian picks up on that singular word. Yes, he knows how ridiculous it sounds—largely because the group adopted the name as a form of mockery and defiance of the lie Rip told them when he gathered them all up.]

Sheer stubbornness, mostly. Their belief that in spite of everything they might be told, and whatever odds that they face, they'll somehow manage to triumph all the same.

[And how they have, first against Vandal Savage, and—if what Rip has been told is to be believed—against the Legion of Doom.]