Re: Imran Ismail attacked by MQM goons
Well, there is only one root for Muhajir, that is people who (their forefathers) in past migrated to Karachi to live in Karachi permanently (forever), from where they migrated does not matter, that is all. 
If anyone migrates to Karachi, intend to live and die in Karachi, think for the betterment of Karachi, consider himself part of the city, than he/she is Muhajir, regardless of his language, religion, cast, culture or looks.
Anyhow, just like many Punjabis would not like to call themselves Punjabi and would prefer to just call themselves Pakistani, it is same with Muhajirs. They can do the same.