In no way am I saying that I condone political violence but there can be rational arguments to justify assassinating heads of state in some circumstances.
The people who think Oswald was motivated by politics have failed to establish what he possibly hoped to achieve by assassinating JFK. Based on the testimony of Capt. Will Fritz, Oswald was aware that US policies towards Cuba were unlikely to change under Lyndon Johnson. So we can conclude that Oswald was politically savvy enough to know that assassinating JFK wouldn't have helped Fidel Castro.
There's no evidence that Oswald suffered from mental illness or was experiencing a psychiatric episode at the time of the JFK assassination. What was most disturbing to the people who investigated Oswald after the assassination was how calm he was given the circumstances. No one claims that he acted erraticly at any point after he was in police custody after the assassination.
So it's difficult to conclude that he did it because he was suffering from some sort of mental condition at the time.
Let's leave it to his own wife to explain what happened:
What happened when Lee came home on the night of April 10,
1963?
Mrs. PORTER. He was very pale, as I said, and he was out of
breath, and I was asking, I mean asked him
to explain about the
note that he left for me, and asked him what happened, and
he
said that he just tried to shoot General Walker. I asked him who
General Walker was. I mean how dare you to go and claim somebody's life, and he said "Well, what would you say if somebody got
rid of Hitler at the right time?