Most of us don't dwell on theory and only accept the facts, which are that JFK had most of his head blown off in public. It may or may not have been the result of a conspiracy and we'll most likely never know. People will always speculate, it's just human nature. Regardless if there was a lone shooter or there were many players that conspired to kill him, most if not all of them are dead by now, and unless one of the conspirators left explicit details in writing about how the assassination was carried out, all it will ever be is an unsolved murder. Personally I think it was a conspiracy, but since I can't prove it I'll just have to settle with not knowing.
There are too many other mysteries in life that I'd rather deal with, like trying to understand women.