It wasn't bullcrap. There was certainly an element of political expediency to it since there existed the potential that the answers it sought to find as to who and why had the possible potential to push us toward war with an adversary with whom we had come perilously close to coming to blows with just one year earlier. So yes there was a lot riding on it. And really given the circumstances this was an incredibly extensive investigation that interviewed hundreds, if not thousands of potential witnesses throughout the entire nation and the world in a relatively speaking short period of time. They didn't spare any expense either. It was important.
Actually there isn't any evidence of Oswald ever having any personal or political/ideological animosity toward President Kennedy. His wife Marina was a big fan of JFK. Mostly because of Jackie. They kept a copy of a Life magazine, or some other publication that had extensively featured John and Jackie Kennedy prominently displayed in their living room. Oswald, who was known to be very controlling of his wife Marina, never voiced any objection to her whatsoever in regard to her admiration for the Kennedys. Also Lee Oswald, according to his brother Robert, was not really a truly political person. " He wasn’t political. He really wasn’t. I say that in all honesty, because he tried to become what he needed to be to achieve his immediate objectives; i.e., he needed to be a Marxist and accept the Russians [to] get the experience in Russia. When he returned to the United States, he didn’t want to be a Russian. He wanted to be an American, to be accepted by the American society, and so wherever he was … he wanted to be accepted. He wasn’t political. He was what’s convenient to be. " Robert also described his brother as probably being the ultimate pragmatist. " He’s going to fit in to where he needs to fit in to accomplish what he needs to accomplish … what is very essential to get by with, to be somebody. That’s what it comes down to — he wanted to be unique, by whatever it took…" Oswald had delusions of grandeur. He fancied himself as being, or destined to be, a historical or exceptional person or figure. Kennedy was simply the vehicle through which he could obtain the "unique" fame or notoriety he so desperately sought and desired to obtain.