He has documented mental health problems and at least two prior hospitalizations for same.  In trial testimony for a previous crime, a psychiatrist characterized him as "psychotic".  Fresno Police Chief Jerry Dyer said the shootings had “nothing to do with terrorism in spite of the statement he made.”

Trying to twist the facts of a case to suit one's own personal prejudices is typical of fanatics of all stripes.  

Contrasting "Muslims" and "whites" is a false dichotomy.  For example, most Chechen and many Lebanese Muslims consider themselves ethnically white.  

And to top it off, this individual clearly has a significant amount of white DNA in his own pedigree.  Self-hatred is certainly a "bizarre belief", wouldn't you agree?