How many founders of people's party were with Z.A.Bhutto just 5 years after the formation of party? There is no political party in the world history which have all those people at inception still there after some time. many idialists leave parties because they refuse to accept that fact that no ideology can be practiced without pragmatism and pure ideologist are not pragmatist. Ground realities can't be ignored in politics. A good example is the difference between Russian and Chinese communism. Success of China is because of their pragmatism and acknowledging ground realities rather than ideologies alone. Gang of Four is a well known example. If those founders of PTI were the real force of PTI who stopped them to form another party based on ideology only and up stage IK's PTI?
If you take away the principle and ideology which drove the founders to form another political party , then there is no reason to believe that the party was really a different party then the traditional political vested parties in to any system .
The fact that there were some reasons and some ground to form a party based on certain principles , indicates that the normal " Pragmatic" approach is killing the ideology of a country and the needs arises from the facts that a party needs to be form which call themselves different ..
What you are basically saying that there is no need to adhere to the principles after the party is formed and well established and in order to grab the power, there is always a need for 'pragmatism" or another words compromises .
I can even buy that to a degree if it holds true only till you able to get the power ( Even though it will still be unethical and immoral) and start to implement your ideology and principles.
But unfortunately ,IK has changed and changed for worst not good. Kicking out Wji Ud Din only because he rightly raised his voice and concern regarding internal politics in party election and IK preferred the same snake who bit him from behind once saw an opportunity. Which proves that compromising on principles under the greed of power is going to destroy the party and smear the principles which were considered once very sacred.