How wrong was that action will never be accepted by people like burqa or khekshan. These earlier urdu people were responsible for present day hatred and racism.
These intelactuals sowed seeds of hatred, prejudices, racism which ultimately shaped up as evil of mqm, now biting the a$$e$ of those who created them. I am sorry I don't see any positive contribution to racial harmony in Sindh. Had they been so good as burqa was saying there would have been minimum hatred and racism based on language, culture, and sect.
I think you're mixing up opportunists who take advantage of society's weak points and present themselves as the "solution" in the shape of an organization or a political party with those who may have been duped into becoming complicit knowingly or unknowingly. Such is the case with the mentioned political party.
As far as people are concerned, it is extremely dilusional and dishonest to say that the early migrants (specifically urdu speaking immigrants) are the core cause of all the issues we face today. That is simply not true. We are where we are today due to collective errors made by the preceeding Govts./Dictators post 1947. You have to realize that the founders of Pakistan did not live long to give the nation a definitive direction, and some rather incompetent people have overtime come to fill the gap whenever the opportunity arose.
That not only resulted in a stalled state of affairs, but denail of pursuit to change some of lingering policies that are still seen as the cause of problems in Pakistani society today.
It is condemn-worthy and wrong to blame any one group of people for the ills of the entire society based on their ethnicity/origin. We're all in it collectively. Some did good for the nation, some did bad for the nation, some didn't do anything because they didn't know what to do.
Lets not polarize the issue and give air to animosity against one group of people because that is just outright false.