John McAfee (a known liar, so take it with a grain of salt) claimed in one of his interviews he gained and kept a clearance despite adultery and drug use by being brutally honest publicly about it all, so he was utterly unable to be blackmailed.

Yeah, that's plausible. They don't care about drugs and adultery. They care that it's leverage. If the world already knows, it's not leverage.

yeah, lying and trust are much more serious