When the closest witnesses to the event give their testimony, confirmed by the response of trained police officers - not to mention the reaction of crowds of people swarming the grassy knoll to investigate what they heard - it's not a matter of case closed - but "mind closed"... closed to all testimony and all visual evidence that might go contrary to a pre-conceived theory.
Mind closed.
And perhaps "eyes closed"...
Moorman's photo suggests the profile of a sniper from the pergola window, and it warrants further investigation.

You don't need an open mind to see a sniper in the pergola window.
You need a hole in your head.