Chomsky, London and Lewis
David Lewis famously argued that the time traveller �can� murder her grandfather, even though she never will: it is compossible with a particular set of facts including her motive, opportunity and skill (1976: 150). I argue that while ordinary agents �can� under Lewis�s conception, philosophers cannot � the latter will not only fail to fulfill their homicidal intentions but also fail to form them in the first place.