Brother,
Because it was not against Pak Army, ISI, Hafiz Saeed or Pak LEAs but was against corrupt, uneducated and and thugs **** Politicians so from GOD knows where, people complained about ethnicity in this film so got banned. Interestingly first ban was imposed by Sayi Sarkar soon realised of situation and withdrawn the notification but on the same time threatened and warned Cinema owners in Sindh to not to play MAALIK and then obviously Federal government has to act also to fulfill GEO's wish. Kabeer Khan can be welcomed, people like Mama Qadeer, Najam Serhi, Hamid Mir, Asmara Jahangir and alike could be praised but no Pakistani especially having a mango & sari loving political government that miss no chance to praise Safroonis so business may not hurt.
@Jonah Arthur thanks for tagging bro.