Ghauri is treted like hero and we have named our missiles after him, whereas India has Prithvi missiles. This shows conflict of Heroes.
Knowing that Ghoris attacks were just to loot or extend his state the only argument handy with his supporters is he was a Muslim and was attacking India to form a Muslim state.
For negative portayal of Prithvi, we have to go through the historical novels. As far a I know, Naseem Hijazi (the top most writer of historical novels) didn’t write a novel on Ghori and Ghori is given least coverage in text books compared to Ghaznavi. On the contrary, we don’t hear much of Jaipal from Indian side as compared to Prithvi.