So if you give a person rocks who has told you he would like to kill drivers by dropping them on cars from an overpass, and he succeeds against the odds in killing someone by this means, you are guilty of providing material support to a murderer--for remember that when the primary violator of a statute is someone who provides assistance to another he is functionally an aider and abettor. The mental element required to fix liability on a donor to Hamas is therefore present if the donor knows the character of that organization.