Didn't the Warren commission also find there was no policy for searching buildings, roofs and windows along the route. Also, the route chosen had been printed in the paper making it easier for Oswald.

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Hanlon's Razor - "Never attribute to malice that which can be adequately explained by stupidity."
Asimov's addition - "Or ignorance."

"On two occasions, I have been asked [by members of Parliament], 'Pray, Mr. Babbage, if you put into the machine wrong figures, will the right answers come out?' I am not able to rightly apprehend the kind of confusion of ideas that could provoke such a question."
-- Charles Babbage