I seriously fail to understand why this is so hard for you people to comprehend.
So let me ask you - what happens if these protestors gain access to areas containing sensitive military equipment? What happens if they light up an ammo dump or start attacking soldiers? What happens when the rest of the world - that already thinks Pakistans nukes aren't safe - sees a large charged crowd barging into a major military cantonment? What happens if along with these crowds - a suicide bomber also gets through? What happens if this crowd starts attacking military personnel or their families? What happens if this isn't just confined to Lahore cantt, but spreads to other sites like Kahuta or Wah or perhaps an AF base? Lahore Cantt isn't just a housing society!!!
And once a precedent is set - who is going to stop others from doing the same? What happens when one of the "religious" parties wants to protest next? What happens if MQM wants to enter Karachi Cantt, BLA wants to enter Quetta Cantt, ANP or JUIF wants to enter Peshawar Cantt, or PPP wants to enter Multan Cantt, or PMLN wants to enter ISI HQ or GHQ??? And how will you then convince the world that your nukes or military assets are safe when every Tom Dick and Harry can simply barge into military cantonments or bases?
This cannot be allowed to happen! Use your brains!!! And these are the reasons it is not allowed to happen in Pakistan or anywhere else in the world!!!
If you want to protest against the Army and think a cantonment is the right place to do it - then protest outside! Hold the biggest protest in Pakistans history for all I care. But you do not get to enter, and you should not get to enter.