If what you say is true and the courts do find people who colluded with the foreign government, then treason charges should follow.
However advocating violence based on accusations and conspiracies undermines the law. Riling and energising a common man to lynch the opposition and taitors is playing with fire. Everyone will then take law into their own hands. Things should be done via a legal way not through force or violence.
What you are saying is correct in principle but what you are referring to is playing with fire has its own reasons, primarily it is the frustration as the people have lost trust in the legal system, I can compile 100s of reasons but here are a few as a starter:
1. Convicted criminal is allowed to go abroad and court asking PM give a written guarantee that if anything happens to NS he will be responsible. In any logical sense who can provide such a guarantee? and why should anyone even allow a convicted criminal to go abroad in the first place.
2. Then this criminal does not provide a sufficient guarantee, court allows him to leave on providing Rs.50 stamp paper. Does it happens anywhere in the world? even petty white collar criminals have to provide millions of $ of bonds.
3. The brother provides the guarantee, in all these last years did ever the court summoned this brother and enquired about the criminal or put him behind bars?
4. Court sessions are called upon on Sunday while cases against NS, SS, Hamza, Mariam, Zardari are moving at snail's pace, there are months between two hearings, why the same urgency is not shown in cases who have robbed billions from the poor people.
5. Shutting down hudabiya paper mill case on basis of time lapse - Just lol
6. Court passing judgements like we cannot stop a crime before it has happened. So basically a person is roaming around on the streets telling in advance I will kill so and so person on this date, yet the law cannot take any action to protect the victim just because he has not killed that person yet. Again lol .......... this is the exact case of a no-confidence motion, people are being bought openly yet no action can be initiated until they have cast their vote.
7. Extra ordinary privileges are given to sharif family when it comes to courts, as the word on the street is that they are the darlings of the legal system.
And there are many many more reasons.