Yes, i know the answer:
In his works, there is no room for greed, exploiting others, superstition, those who teach nonesense as God's laws (you know their name well), lie as Exalted Prophet's saying, falsehood as history. He says the truth even if this truth is not in his favor.
And this is a threat for the social status of some persons.
Although there is another thing, some persons are emotional and their speech is based on their feelings instead of the reason.