The reason George H.W. Bush was in Dallas the day of the assassination was becasue he was a CIA agent, and working on a black bag job that had to do with the botched "Bay of Pigs" invasion. That was a Richard NIxon operation and JFK pulled the plug on it in the last minute, leaving many good men to die.
I will go on to show how Bush, Gerald Ford (Warren commission) were all rewarded by Nixon for fathful service. Good things happen to people that play the party line.