I might agree about Oswald's ability to plan it except for the fact that he worked in that building. He had all the time in the world to think about how he would go about shooting out that window at the targets he peceived to be causing all his problems ala Charles Whitman. And then Kennedy's route just happen to go right by there and fate had given him a chance for the fame he wanted, right outside his work place.
Serial killers function in society until they get caught. People might not like to be around them but usually have no idea that so and so is a serial killer. Oswald was probably more stable than them.
One thing is for sure, it would have been better if he'd got to stand trial.

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You're a coward and a liar and a thOOF - Bart Sibrel