UPDATE: It must be considered that the US has alien technology and has already made a super-weapon that can utterly defeat all other known earthly weapons, nukes and missiles included. We are encouraged to speculate in this way because US neocons are acting as if they have a super-weapon.
In this vein, we can further assume they are now probing and skirmishing on all fronts—military & informational—with their primary adversaries, China and Russia. Their goal is world-domination. Their battle strategy is fundamentally forced on them (and forced on Russia & China). It is Kill-Or-Be-Killed, KOBK.
None of the top three players can back down without being killed. Kill in this context means ‘utterly defeated into complete and total submission’. Many people often are killed in a KOBK conflict, but death is not a necessary component.
US neocons possessing a super-weapon of alien origin could be the real reason they are hiding information about alien contact.
It’s also possible, they are bluffing, pretending to have an alien super-weapon. The stakes are as high as they can go—total control of the planet—so do not look to the rules that govern your own life to understand them. ABN