So I started playing again after some time. First I had much fun with all the new content. But then, on bloodmoon, the zombies came and attacked my base. I have a moat around it, 6 blocks wide and 40 blocks deep. My base is in the middle of it and below it. The moat (inner and outer walls) is made of pure concrete. So the zombies came, saw the moat, turned around and dug all the way down, below my walls, under my moat, under my base, entered through my mine from below and attacked me from behind.
THIS IS ABSOLUTELY STUPID!!!
Why do they do this. It makes the whole base