Birferism is clearly a mental disorder.
To believe, despite clear and convincing proof to the contrary, that the pres is foreign born and a Kenyan and a Muslim manifests a clear demonstration such minds are either woefully ignorant, mentally feeble, or malignantly motivated, or a combination of any or all three defects.
Such minds as birfers would be woefully subjectable to ponzi schemes or cult religions because they must believe they have access to secret knowledge that others cannot have because they are unworthy personally, morally, or mentally.
Good heavens, these folks are the political equivalent of a our own Jeremiah or Silhouette of USMB.