Now, if the origin of the suffering is attachment, this always is not correct. Because people born with a birth defect shall suffer forever. Say he, or she is a deaf person, or a blind person, or having no legs or no hands etc. This person did not have any attachment to cause this sort of a suffering. This is what I am trying to indicate. Buddha was a humanbeing and he must have been mistaken too. No one is perfect. If you believe that Sakyamuni Buddha was a perfect person. That might be your belief but, it can't be factual.