President John F. Kennedy was killed under orders of MJ12 as he was threatening to tell the American public the truth about Roswell. JFK was of the opinion that the public would accept the fact of the alien presence without undue panic, but in those days MJ12 was still affronted with the personalities and actions of the Service-to-Self aliens that the CIA, as an arm of MJ12, continually made alliances with. JFK believed in the strength of the human spirit, in its ability to sort things out, and in any case felt the public had the right to know what they were facing. The CIA wanted the knowledge they hoped to get from the Service-to-Self aliens who were playing them along, and they wanted this knowledge for themselves and themselves only. Thus, they used their influence with MJ12, which in those days was considerable, to press for JFK's assassination, which they were allowed to implement when the order was finally given.
MJ12 has recently released us from our agreement to remain silent on the Kennedy assassination. This agreement to remain silent covered certain matters involving the Secret Government and the alien presence. Should humans be incensed by this, that we knew something they desired to know but would not share the information, they should contemplate what life might be like without our having an agreement with the government. In this situation, only the Service-to-Self aliens would be communicating, having as you say the inside track. Such was the situation when we first encountered your government, which had been vastly misinformed and was engaged in all manner of harmful practices under the influence of the Service-to-Self crowd. This has now turned around, but we are honorable in our agreements, and a promise made was to be a promise kept.
The JFK incident is one which hardened and increased the determination to keep elected officials in the dark as much as possible about the existence and activities of MJ12. Given that the US is a democracy and could potentially elect a dark horse written in on the ballot, such stringent rules about non-disclosure kept elected officials from the danger of being killed. Prior to JFK, presidents and other elected officials were already being kept in the dark, a decision made by an exiting president who did not want a rival political party granted such knowledge. JFK learned what he did due to leaks, shared this with a girl friend long known to be so reliant on sedatives that she could be expected to murmur forth this information with the next man who shared her pillow, and argued incessantly with MJ12 representatives who came to visit him under other pretenses.