You may also wonder, why are focusing on individual teachers and not on ideas or collective schools? Again, the reason of this is the hijacking of all schools of thought by criminals and ultimately by MIC. Some individuals are capable of independent thinking, but schools of thought, groups and institutions are typically hijacked. Sometimes secret societies are capable to keep their ranks secret and unpolluted by the informers and provocateurs, but this is rare and the teachings of these are rarely available. So this is why we have to rely mostly on individual teachers and why their biographies and personalities are of importance - we judge about their sincerity by their relationship with the establishment.
MIC = military-industrial complex