Look. I am not some mechanic, inventor, carpenter or doctor. My skill set in said situation would be much more mundane. I understand security in hostile territory, I can learn quickly enough to be an extra hand in anything and (I have at least been told and have a track record for) being a natural leader of people with a decent ability to mediate conflict resolution and team strategy.

That being said, and I haven't seen the third epi yet, security should have been a top priority in the first two epi by at least closing off avenues of ingress/egress in such a large area. The wanders trying to see what was in the building should have been the clue there. For goodness sake a high OP/LP at least.

With such a large area, and now a pattern of intrusion, they must cache supplies.

I am sure that they are disallowed to create some security systems, such as fire hardened spears, shields, pungi sticks, rebar batons, etc. But C'mon! what was deal with the fire extinguisher in a riot. It'd be easier to make mustard gas. I will not believe that these people are so dense as to ignore the obvious, so I will blame the show itself for not allowing them to do it...yet.