This is one of the main reasons why a person is targeted by narcissist gangstalkers. They're so negative that try to destroy any good in this world. They're also very deceptive while trying to destroy naturally good People who are pure and innocent in their nature
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The narc will never stop stepping over your boundaries. For as long as allowed to they will continue to do so with utter contempt for your principles. The only way to stop them is to cut them out of the equation of your life. It can make the narcissist angry. That evil narc is beneath the level of contempt. Void of understanding and empathy. They just don't care who they step on and hurt in the process.