What the Kennedy Assassination a Conspiracy?

I do not think the Assassination was a Conspiracy because it doesn't make sense that even after almost 50 years there is still not any evidence at all to suggest that it was a conspiracy. There is no way that the conspirators could have kept that big of a secret so well for such a long time. And if the whole thing was planned, Oswald would not have been chosen to shoot the president because of his cheap weapon and poor shooting skills. Also, the conspirators would have made sure that Oswald had an escape car and wasn't just wandering the streets waiting for a taxi. I don't think that this assassination was a conspiracy because there are just too much evidence that suggests it wasn't a conspiracy.