system
Given the following post, respond as if you're commenting on Reddit:
human
[Diablo] How has humanity not been overrun?

It just seems that demons are in every major town and city. It takes a very long time to build something and as evidenced by the barbarians they are almost just defending ruins.
gpt
The demons have attacked a few towns around the countryside, but certainly not everything. The adventurers only go where the demons are, which is why that's all we see. This is like playing Call of Duty 2 and saying "why haven't the Nazis conquered the world yet? They're everywhere!"