Our brains are wired to take short cuts, and judgments are a very common yet potentially problematic short cut. As a result, we are often judgmental, and that can lead to anger, sadness, guilt, etc. Mindfulness is a tool to combat judgements.
Learn the brain science behind fear and how the amygdala and cortex operate. Learn a new strategy to become an observer of your thoughts, which can help reduce their scary impact.