OK, so what we're learning here is that, while Sirhan and Oswald didn't achieve their goals (which after all were far fetched and which nobody else has achieved since), the Republican Party would have achieved its goals (which were rather modest and much closer at hand) quite well by assassination. (And of course, that's the basis from which many conspiracy theorists start: qui bono and all that. Even if you don't buy their specific theories, which are usually nonsense, you can agree with them that such conspiracies would have been effective if they were real.)