Every illustration breaks down at some point but think of this in relation to evangelism. Non-Christians are not the enemy. They are people for whom Christ died. The intention of this analogy is simply to cause us to think of the DMZ’s of our world and meet people there.
We are always to be on the offense with the gospel but a times we need to meet people in neutral territory. If non-Christians feel under attack they may “return fire” or run away from us. This is definitely a judgement call since each situation is different, but there are times to connect with people in a DMZ.
Non-Christians will probably not come to your church, so meeting on neutral ground may be a way to connect. There are many of these DMZs: coffee shops, sporting events, backyard BBQ, community projects, homeowners associations, clubs, sporting events. The list is limitless. It is possible to meet people in neutral zones that do not compromise your personal holiness.
The issue is this…. don’t be surprised if the “enemy” doesn’t come into your barracks. You might need to go out to neutral territory to meeting them.