Influence is manipulative depending on how it is being used.
If the manipulator attempts to get someone to adopt what the manipulator himself regards as wrong, it resembles lying. The liar tries to get you to choose a false belief or to make a mistake in what he thinks, feels, doubts or pays attention to.
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We are continually subject to manipulation. For instance:
Manipulation is wrong because it involves immoral techniques. It means treating the other as mere objects and not as a rational being.
What matters in identifying manipulation is the intention of the person using it - whether the influence is being used to put the other person into a better or a worse position to make a decision.
... is an emotionally unhealthy psychological strategy used by people who are incapable of asking for what they want and need in a direct way, to control someone or something to their advantage, often without anyone knowing it.