The reason people don't trust is they don't follow their instincts.
The fear of people is the fear that we can't predict their behavior.
We choose not to predict their behavior, because we won't follow our instincts.

The author said:
The human being is the only prey in nature that cooperates in it's own vicimization. Imagine an impala in Africa looking at a lion and thinking, "But this is a nice lion."

Here are signs that someone is actively trying to deceive you:

forced teaming - talking in terms of "we" like "we're in this together - establishes premature trust

charm and niceness - if someone actively tries to charm you, the act is always directed toward a goal - niceness does not equal goodness, it is a strategy of social interaction for people seeking control

too many details - the liar thinks that if they throw enough details at you, you'll forget the context, and the original lie will slip by

typecasting - "you're probably one of those people who..." - a slight insult, with the goal for you to refute them, in order to engage you and establish premature trust

loan sharking - trying to do something for you so you will "owe" them

unsolicited promise - a promise is not a guarantee, all it does is show the speaker's desire to convince you of something

discounting the word NO - if someone ignores you when they turn you down, go on as if you haven't said anything, they are trying to control you