He is for most of the educated Sindhis. Raja Dahir is regarded as son of soil who died fighting foreign invasion. While Muhammad Bin Qasim is regarded as tyrant foreign invader who massacred Sindh’s people.
You need to understand that most Sindhis don’t look up to their foreign invaders. Whether be it Muslim or other faith. Just look up heroes of Sindh which include Raja Dahir, Makhdoom Bilawal, Dollah Darya Khan Lashari, Hemu Kalani, Mir Sher Muhammad Talpur, Hosh Muhammad Sheedi. Which all died fighting foreign invasions of Arabs, Arghun Turks and British.