A political party is a public property. Anyone can join it. But its the leadership of political party that gives it the guidance.
As long as PTI adheres to its vision on which it was established, it does not matter who joins the party as long as they follow the party policies.
We are an unforgiving people. We will not forgive someone for his or her past but we individually dont learn from our mistakes, learn from our history and thus keep repeating the same mistakes. While its easy to criticize anyone, its import too to not lose sense of perspective and at times try to introspect too.