I used to be a person who believed there was a second shooter, until I got older and the facts overwhelmingly support Oswald. His own brother was interviewed quite recently and basically said, "My brother was insane". He left his wallet and wedding ring on the dresser for his wife before he left that day. Told his friend he had "curtain rods" to take to work.
The only question that baffles me was how he was about to defect to the Soviet Union and return no questions asked.
1.How did he fire so many shots in the amount of time. (I realize the first shot shouldn't be counted.)
2.You believe the ridiculous 'single bullet theory'?
3.Why did Jack Ruby kill Oswald?
The 'I was angry he killed the President' he basically said is nonsense given that he was a member of the Mafia which hated President Kennedy. If this weren't part of a conspiracy theory, every logical conclusion would be that Ruby killed Oswald to silence him.
I don't think there is any reason to believe that Ruby had personal views on Kennedy that differed from the views of the Mafia.
I don't believe in most conspiracy theories, but in this case I think Oswald was telling the truth when he said he was 'just a patsy.'