Again, I'm not questioning the Hazara's civic loyalty to the Pakistani state. I acknowledge they are probably more loyal to the State than some other Pakistani ethnic groups, like the Baloch who are indigenous to that region. I only bring up race because the reality is that the Hazara will never blend into the mainstream Pakistani population and will perpetually remain a tightly-knit community that ethnocentric. Their heightened visibility sets them apart from all other Pakistanis. It's like a community of Scandinavians settling in Nigeria. Nigeria is divided into many different ethnic groups, but if you add Scandinavians to the mix, they're going to stand out big time and make the other ethnic differences among Nigerians seem trivial.
Qaid-e-Azam came from an Ismaili family, but he did not personally remain a part of that community. He became part of the mainstream Muslim community.
So I'm saying that the Hazara are already so visibly different from the rest of Pakistan, and being Shi'ah they add another layer of great difference. I am not attacking the Shi'ah sect or the Mongolian race, I'm only pointing out that they are different from the mainstream.
From my experience, since I come from an Ahmadi background, Ahmadis and Sunnis are socially more at ease with each other than Sunnis and Shi'ah. The reason is because the difference between Ahmadis and mainstream Sunnis are quite minimal, revolving around a few abstract theological points. In terms of practice of Islam, they are virtually identical. But Shi'ah definitely stand out because their practice of religion is visibly very different. Their mourning rituals in Muharram, their different style of namaz, adhan, and even different timings for opening the fast in Ramadan, almost makes it seem like they are a separate religion from mainstream Muslims and not just another sect of Islam. I mean as a Muslim, when I see people taking off their shirts and cutting their backs with blades, blood everywhere, it's as alien to me as seeing a Hindu waving a plate of incense before an idol in the form of a half-man half-elephant.
This level of diversity and heterogeneity only works in secular, liberal Western countries. In places like Pakistan its a recipe for disaster.