Seeing Lee Harvey Oswald as an actual person rather than just a name, makes it very difficult for me to believe that he killed the president. Lee was very unorganized and just did things on  whim, he didn't really think things through. This can be seen when he shoots himself and when he attempts to assassinate the general. Both of these acts are done in haste and do not have the exact outcome that he had hoped for. He is allowed to stay in Japan after shooting himself but the wound only appears to be a mere scratch and nothing major. When he attempts to assassinate the general, he has the dates wrong. Further more when he does actually shoot the general he hits him in the arm, and to further more be belittled the general removes the bullet with a pair of tweezers as though it were a splinter

From his previous attempts at doing harm to others especially his previous assassination attempt just causes me to have some doubts about his success in killing the president. Even if Lee had been assisted and had help from others, he himself would have failed. He had such pride that he didn't use a  more advanced weapon and insisted on using his own that was old and outdated. He wasn't really a good shot which could be seen when he shoots the general in the arm. If he couldn't shoot a man who was sitting still, how could he shoot and kill a man that was moving.

I think that there may have even been 3 shooters. Two others to account for the actual shots that hit the President. It is highly unlikely that Lee managed to do it, maybe he did in fact shoot the president, but he didn't kill him.