I don't know if it's misconception or truth ,
majority of urdu speaking fear that if mqm will end they will get persecuted to in terms of not getting govt jobs , or having other rights , people living in pakistan before partition became jealous of muhajirs when they came to pakistan , cause it was these urdu speaking majority that was well educated and hold majority of govt jobs , even when ayub khan brought phatans from other areas those phatans were brought as labours and low skilled jobs , these phatans saw bhaya loogh as they call them , having all the riches while they constructed homes and drove buses and taxis , while punjabis have always dominated whole pakistan they have never tried to adopt petty crimes like target killing or extortion (although it has changed now) , different ethnic people brought in karachi created rift between muhajirs and Sindhis , phatans etc , we as nation has always being played with muhajir card , phatans card , Sindhi card , punjabi card , balochi card .
Always these parties have exploited those who suffered with injustice and uneducated with these cards , muhajir always being told that Sindhi will take your jobs , phatans will rape your girls , Anp always preached phatans k Tm loogh hamesha rickshaw taxi chalao ge agar mqm rahe hakoomat me , ppp always talked about how backward Sindh is and how luxuriouy people in Punjab and karachi are enjoying , pml n used punjabi card when ppp was there with jaag punjabi jaag .
The origins of these parties has always been using ethnicity card now they talk about whole pakistan , but that will only change later cause majority have grown in 70-80's have been influenced with these ethnicity cards .
i found pti only party whose origin didn't started with one ethnicity or religious card , while how shady there ambitions are is another thing .