I think Murder.
Murder typically has a greater impact than rape does. Its not just the person being murdered who is effected, Its the victim, the murderer (after they are caught). The murderers family, the victims family.
Perhaps my perspective is skewn thanks to almost being murdered, but I know after looking at the situation, that had the attempt been sucessful, I would be effected, My biological family would have been effected, my family from romance would be effected would have basically been destroyed, The shooters family would be effected by watching him waste away in jail/mental hospital for years. So an issue between 2 people disrupts the lives of many.
I know rape is a damaging thing, but I seriously dont see its impact going quite that deep or effecting that many lives.