Because Pakistani liberals are the biggest Islam-hating virmins I've ever seen. They "own" their ethnic, non-Muslim history and disparage anything related to history that's 'Muslim history'
These ethnic secularists hate our Islamic Republic and want to damage it in whatever way they can. PM IK has people like Fawad Chaudhary in his cabinet that pushes these kinds of agendas and praised Ranjit Kanjar's statue.
The whole argument of the thread is that he persecuted Muslims, and was a Sikh ruler, and tries to compare him to Hitler.
I mean, the OP knows Mughal history as well, right? Some of the Mughal sultans also persecuted other groups. So, according to OP, would their statues be okay, since the persecuted people were non-Muslims?
The point I am trying to make is that this is simply history, and how leaders were in history save very few of them. We remember them for their governance, military expertise, and such things.
Hope the point gets across.
EDIT: I just did a quick read on his empire on Wikipedia. It mentions that he built mosques and temples. His sovereignty was accepted by Afghan and Punjabi Muslims, and that they even fought under his banner against Afghan forces. There are also accounts by then historians on his cruelty but also accounts by historians who deny this.
I think the empire followed the same pattern as literally every other empire in history. Conquer, destroy the previous empire's subjects, buildings to remove their influence, then go back to being somewhat considerate of the minorities like the previous empire.