what a Exaggerations by couple of fellow member who are located outside of karachi!
There is no sercurity issues here. Yes killings are happenin but they are "TARGETED" no one gona come shoot you just becoz ur stand at a pan wala or a in busy crowed place this aint bollywood movie where bad guys can do whateva they want. Yes you need to be careful as there are street crimes which is normally in every cosmopolitan cities of the world.
Here is a tip: Just Relax nothing gona happen the more you gona think abt it the more likly its gona to happen so just feel relax and dissolve in the crowed as you part of them but polite and friendly.
Peace