I need to usually have certainty and control in life (intolerance of doubt). I have to be accountable for all my ideas and feelings all of the time. I must do something to regain that control if I lose control of my thoughts. Thinking the idea means it’s essential, which is crucial because i do believe about any of it. It really is unusual to possess intrusive ideas, and them it means I’m crazy, weird, etc if I do have. Having an intrusive idea and doing exactly exactly what it shows will be the same morally. Contemplating doing damage, rather than preventing it, is equally as bad as committing harm (also called Thought-Action Fusion).