The culprits behind the death of the assault-weapon ban, authored by Sen. Dianne Feinstein, that was part of other measures heading to a Senate vote, are not anonymous Americans, or faceless members of a powerful gun-rights group. They can be named, and found, in Washington: The 535 officials whom we elected to Congress, who are ignoring the will of the people to institute commonsense reforms to discourage the kind of carnage that happened in December, as well as at sites of mass murders perpetrated with the help of high-capacity killing machines.