If he is autistic, as many of friends and relatives suspect, that might help explain his weird behavior that night when talking to police.
It wouldn't explain the discrepancy between his story and the laws of physics and science. But it would help his explain his demeanor and actions.
Knowing that Steve has a real and discernible disability might have been the difference between a jury finding him guilty of First Degree and Second Degree murder. Maybe even manslaughter.
Since no evidence was presented along those lines, all the jurors have to go on is their hearing of Molin's 911 call and a half hour portion a police interview with him. That, and his awkward behavior in court. Not very much.
UPDATE: And yet I just found this in the Journal of the American Academy of Psychiatry and the Law Online
Asperger's Disorder remains an under-diagnosed condition because of clinical unfamiliarity with its adult presentation. As forensic clinicians become familiar with the presentation of Asperger's disorder, it appears that affected individuals are over-represented in forensic criminal settings. Unique features of such persons may heighten their risks for engaging in criminal behavior. Both Theory of Mind deficits and a predilection for intense narrow interests, when coupled with deficient social awareness of salient interpersonal and social constraints on behavior, can result in criminal acts.... From a neuropsychiatric perspective, these disorders appear to have a biological underpinning for deficits in empathy, a finding that may have important repercussions when assessing remorse in criminal proceedings.Asperger's is a form of autism.
Which is to say, opening the door about an autism diagnosis, might have allowed the prosecution to ask such an expert about the "heighten risks" of criminal behavior and all that other stuff.