Any more than there is no astro-mechanical concept behind the sun rising in the east tomorrow morning. Part of me weeps for the poor, deluded fools until I realize how much of Western civilization is in the same ragtag march toward the destruction of their own history and cultures. At best, it may be a revenge killing, but for the personal motive why is a question waiting to be answered.

--H.L. Mencken, The Baltimore Evening Sun, July 26, 1920
Indeed, as we are not informed of the motives, how can anyone rule out racial/religious factors?
Latest bits of information are that the suspect is from Antilles, is 33 years old, and may have a history of mental health problems.