Yeah, let us allow the camping of safezones, because that seems like a logical comparison...
Perhaps you didn't mention things like drug fields or anything because they are dangerous areas and that's what you expect....
In no way shape or form are you allowing the disruption of civilians gameplay? It's the KILL ON SITE area? What "civilian" is going to be frequenting there? The people that go there aren't there to make friends or pick apples, they are there to buy big guns!!
If anything, you are helping the sweet little innocent civilians, this is why;
Gangs buy big guns, instead of using them on civilians they use them on the other gangs (not civilians because civilians don't go there) trying to buy big guns.
Therefore, less big guns are purchased, and some of the big guns that are purchased stay in the KOS zone.
If you were really that concerned about the poor civilians, perhaps adding a store with all the big guns wasn't the smartest idea?