Scripture- He said, "Satan circulates in the human mind as blood circulates in it, and I was afraid that satan might throw an evil thought(or something) into your hearts."
This is the way mind control works by inserting thoughts into the human population.
Creating depression or using people who are depressed is traditional because they have less brain activity in the frontal lobes which are used to control will and motivation. This makes them more succeptible to brainwashing and programming techniques. Lack of sleep breaks down the will too. The idea is to take control of the sense of self and the will of the person.Excess stress from torture causes brain changes from cortisol in the frontal lobes and prolonged pain shrinks the brain.
S.A.T.I.N.- Silent Assassination Through Adapting Networks
The basic concept behind the best silent assassination is not to stage a suicide but to cause one. This is the equivalent in physical renditions of torture of a subject everyday while leaving a gun by his side in a contained room and then the torturer claiming, "I'm not responsible for their death. They killed themselves."