Every emotion/trauma affects you and these effects manifest somehow. These effects are self-regulated via feedbacks like "I feel X", "I'm not feeling OK", "Hey, this makes me happy" or "Why do I feel like that", etc.

Ignoring an emotion's or secondary effect's presence removes the self regulation circuit hence, allows it to run amok. Since person trained him/herself to ignore these emotions or its manifestations with great effectiveness, wounds grow deeper while practitioner pretends it's OK.

At the last stage, person permanently ignores the problem and pointing to it results in violent responses from the affected person.

I've met with people these symptoms. All of them practiced or was practicing self-affirmation / self validation practices with minimal or no supervision.

Every practice, done mindlessly is dangerous. Including Zen, Yoga and others.