To admit that it was part of a large conspiracy is to admit that the liberals are wrong about their open borders policies.
And that Obama and Holder are incapable of keeping us safe. Droning people to death is useless if you are afraid to pursue Jihadists on US soil. Politically it is easier killing people by drone strike then doing the necessary and more humane work of rendition and aggressive interrogation. The FBI had already interviewed Tamerlan about his jihadist leanings and then dismissed. Sorry - but Obama and Holder missed it.