Michael Kelly from "When Innoncents are the Enemy"
If it is morally acceptable to murder, in the name of a necessary blow for freedom, a woman on a Tel Aviv street, or to blow up a disco full of teenagers, or to bomb a family restaurant -- then it must be morally acceptable to drive two jetliners into a place where 50,000 people work. In moral logic, what is the difference? If the murder of innocent people is for whatever reason excusable, it is excusable; if it is legitimate, it is legitimate. If acceptable on a small scale, so too on a grand.