Because they respect the army or they are scared of it, obviously IK and TUQ wouldn't want to be in army's black list.
I have seen in the videos, protestors throwing stones, putting vehicles on fire, etc etc. If they come close to any government institution, Police will have to take actions. It is not police's fault. If police fails to control them, then it will shame for Pakistan that their police is inefficient.
Politics n democracy = revenge, and when people themselves do corruption, theft, murder, littering on ground, fraud, eve teasing what would that be called as? People get the government what people deserve, jesi quom wesi huqumat.
What are the good things, what Nawaz government has done? I am sure you will find many. The government runs of 5 year plan as in India. The Nawaz government will complete the projects started by Zardari and planned by zardari, the next government will run on the same plans what Nawaz government will plan. Koi farakh nahi hota.
IK will do exactly the same what nawaz and zardari is doing. There are a lots of things what you learn when one is on seat.
When Govt. wants to open trade with India, lowering cost by 150%, then you people shout, ghaas kha lenge lekin India se nahi lenge. aur jab ghaas khany ki baari ayi toh Nawaz ka gala pakad liya. double standards.