Hate speech row: Why no arrest of hate mongers?

Days after hate speeches at Haridwar Dharam Sansad, the Raipur Police filed an FIR against Kalicharan Maharaj for using derogatory words against Mahatma Gandhi and hailing Nathuram Godse for killing the father of the nation.

Meanwhile, there have been no arrests made by the police over hate speeches at both the Dharam Sansad in Haridwar and Raipur. So, why no arrest of hate mongers?