Just thowing out some simple ideas based on the fact that those this man supposedly killed are targets which make no sense from what you would intuitively think. It makes no sense at all.

Considering the chemcial composition of the drug and allowing psych stress could have played a role, although maybe not and he could have had other predspositions for biological dysfunction, here is a thought that ties in possibly with elements possibly even related to utism.

The recent study on genes and Mecp2 says this:

"The top dysregulated pathway map in the young autistic brain was the A2A receptor signaling pathway (Table 1, Diagnosis main effect map folders). Adenosine receptors play important roles for both brain development and function including the regulation of neuronal stem cell proliferation (via nitric oxide signaling) [57], synaptic plasticity, motor function, cognition and emotion-related behaviors. This pathway has been a therapeutic target for studies of other complex neurologic and psychiatric disorders [58]."

I shouldn't mention the vaccines he has been given in the military as a factor, but you can use your imagination. Then he may have been given Lariam.

If this drug effects the A2A receptor there may be a connection to nueropsychological effects.

Wiki says of A2A:

"The gene encodes a protein which is one of several receptor subtypes for adenosine. The activity of the encoded protein, a G protein-coupled receptor family member, is mediated by G proteins which activate adenylyl cyclase, which induce synthesis of intracellular cAMP. The encoded protein is abundant in basal ganglia, vasculature, T lymphocytes, and platelets and it is a major target of caffeine."

If the basal ganglia is impacted via A2A receptors it could be effecting Thalamocortical radiations and comminication with the cerebral cortex and thalmus.

Wiki says of this:

Absence seizures

>Thalamocortical radiations have been researched extensively in the past due to their relationship with attention, wakefulness, and arousal. Past research has shown how an increase in spike-and-wave activity within the TC network can disrupt normal rhythms involved with the sleep-wakefulness cycle, ultimately causing absence seizures and other forms of epileptic behavior. Burst firing within a part of the TC network stimulates GABA receptors within the thalamus causing moments of increased inhibition, leading to frequency spikes, which offset oscillation patterns [9][10] . Another study done on rats suggests during spike-and-wave seizures, thalamic rhythms are mediated by local thalamic connections, while the cortex controls the synchronization of these rhythms over extended periods of time. Thalamocortical dysrhythmia is a term associated with spontaneously reoccurring low frequency spike-and-wave activity in the thalamus, which causes symptoms normally associated with impulse control disorders such as obsessive compulsive disorder, Parkinson’s disease, attention deficit hyperactivity disorder, and other forms of chronic psychosis [11] ....

Evolutionary theories of consciousness

Theories of consciousness have been linked to thalamocortical rhythm oscillations in TC-CT pathway activity. One such theory, the dynamic core theory of conscious experience, proposes four main pillars in support of conscious awareness as a consequence of dorsal thalamic activity [25]: 1) the results of cortical computations underlay consciousness 2) vegetative states and general anesthetics work primarily to disrupt normal thalamic functioning 3) the anatomy and physiology of the thalamus implies consciousness 4) neural synchronization accounts for the neural basis of consciousness."

This would be much more complex a reaction, but this is a simple theory and theoretical theories on consciousness
enter the picture too.

Have we not already gone through this???
I mean even "Law and Order" did a show on it?
Is this still the same one?

George-Andreas Pogany stated in a 2005 msnbc.com news article, that Lariam (mefloquine)caused him to become panicked and disoriented and that he reached for both his loaded pistol and rifle as he thought he saw the enemy bursting into his room. Pogany asked his superiors for help; the Army packed him home to face charges of cowardice — the first such case since Vietnam.

Hallucinations linked to drug given to troops:
http://www.msnbc.msn.com/id/6947472/ns/health-mental_health/t/hallucinations-linked-drug-given-troops/