There's your motive, right there.
FBI:
“We have no idea what motivated Mr. Zazi to drive into the base as he did.”
“Maybe his gas pedal was stuck...”
“And what was all the screaming about some snackbar in a alley?”
“A Muslim named Hafiz Kazi ....
There’s your motive, right there. “
That is a new revelation! The local accounts ( I live about 30 miles from Travis AFB) were that he was an immigrant (nee permanent resident) of long standing from India. There was no mention made of any mooslim heritage.