AI causing monsters to randomly attack berry bushes, bypass player for structures
Patch 0.155.7 changes monster AI some. Now, indeed, monsters will attack structures. They will run right by a player to do so, ignoring the Viking screaming "Coward, come and fight!"
Also, I witnessed both skeletons and greydwarves in the Black Forest destroying blueberry bushes. These were NOT fenced in player structures, so that seems like an unintended consequence. It would be wrong for the monsters to aggressively destroy food nodes in any biome.