Christopher Dorner sounds like an injustice collector. All that bottled up anger.
Unless he has a medical condition associated with the development of delusions, he fits the criteria for Delusional Disorder, subtypes grandiose and persecutory. Will he live long enough for anyone to make this diagnosis? Likely not.
http://med.kufauniv.com/dr/arfat/lectures/Delusional Disorder.pdf
Diagnostic criteria for 297.1 Delusional DisorderDiagnostic criteria for 297.1 Delusional Disorder
(DSM IV - TR)
A. Nonbizarre delusions (i.e., involving situations that occur in real life, such as being followed, poisoned, infected, loved at a distance, or deceived by spouse or lover, or having a disease) of at least 1 month's duration.
B.*Criterion A*for Schizophrenia has NEVER been met. Note: Tactile and olfactory hallucinations may be present in Delusional Disorder if they are related to the delusional theme.*
C. Apart from the impact of the delusion(s) or its ramifications, functioning is not markedly impaired and behavior is not obviously odd or bizarre.*
see mood episode below
D. If*mood*episodes have occurred concurrently with delusions, their total duration has been brief relative to the duration of the delusional periods.*
E. The disturbance is not due to the direct physiological effects of a*substance(e.g., a drug of abuse, a medication) or a general medical condition.*