I believe you live in India.
Now suppose one of your Hindu neighbours, for whatever reason, decided to kill you (maybe he do not like you being Muslim or have property dispute or whatever). He accused you that you made fun of his cow and that means you deserved to get killed. He gathered a group, gave fiery speech, raised their religious temperature, and made them agree that you should be lynched to death.
To save your life you ran to nearest police station and took refuge there. Anyhow, your Hindu neighbour took his gathered crowd as mob to police station demanding police to hand you over to them so that they can kill you, and when police resisted they attacked the police station.
What you think police should do?
A: Should they capitulate in front of the mob with excuse that they cannot do anything in front of the mob, as that would endanger their own life, and thus hand you over to the mob so that they can lynch you to death?
Or
B: Defend you at whatever cost, even if they have to call army and if required to fire on mob live bullets and kill many in the mob to stop them reaching and lynching you?
Note: My answer is ‘B’ regardless of whoever is the victim under protection and in whatever country … and I believe that those who answer ‘A‘, they are no different from people in the mob and deserve same treatment what they like for others.
Actually, I also believe that such mobs are crowd of cowards and it is inaction of police that they get the courage to lynch others on their like and dislike. If police or law enforcement agencies, to protect life and property of other citizens, would start shooting directly at such mob killing these devils indiscriminately, that would not be unlawful or wrong, rather that is what a police should do as duty, and if they would do that, shoot at such mob, indiscriminately if needed, to save life of other civilians from getting lynched, then such evil from society, that is spreading in Pakistan fast, would stop.