Psyops are no joke, though we joke about them, they are massive and ongoing.
IO means Information Operations, which means every kind of manipulation possible of individual, group or national information environment.
Belief structures are evolutionary and dynamic and that when we learn or forget we become different people with different beliefs.
Our beliefs and ourselves are based on all we have learned, experienced and thought about.
It's important that what we learn be true for that reason. What we learn is our personal operating system.
Nonlinear digital environments are error intolerant. Lies propagate very quickly in high density information civilizations and do tremendous damage; the deliberate introduction of error into cybernetic or computational systems, silicon based or biological, is a crime against every user of that network.
"Thou shall not bear false witness" means don't deliberately introduce error into a system because not only does it do damage, if it is retained in memory it will continue to do damage.
Covertly introducing error at any level into an information processing system (like human mind-internet) is recognized form of attack. One of the less well-known attacks on consciousness, is the cognitive equivalent of what in the virtual world is called "database integrity attack." This is the surreptitious introduction of error into data bases where as long as it goes unrecognized, error persists in memory, and the magnitude of the error compounds with distance from the calculation.
This is a serious attack. John Von Neumann mentions this computational axiom in Computation and the Brain. In any case the accumulated errors in biological memory can kill vulnerable species - like us - by degrading cognition past the point where we are able to comprehend what is happening to us.