Delusion: an idiosyncratic belief or impression that is firmly maintained despite being contradicted by what is generally accepted as reality or rational argument, typically a symptom of mental disorder.

Delusions unlike hallucinations are not rooted in any sensory input (voices or vision). If these are just beliefs however idiosyncratic, I don't see how the dopamine theory explains it. The connection between dopmanine receptor blocking and delusions is unclear to me.

Specifically, my son (16) has had the cops called on him twice for no fault of his and after watching police brutality videos has developed a legit fear of cops. He feels his (pacing, stimming and other odd behaviors) are target for bullies to get him in trouble with the law. His fear of cops has reached obsessive levels so much so that he refuses to interact with others because they will call the cops on him.

Would you say this is delusional thinking or fear rooted in reality?