Attack on Sight – Cannibals
This will work better if you give your men the "attack enemies" job.
This will cause your faction to attack members of cannibal factions on sight. Including Fogmen. They won’t wait for your command, and won’t wait until they’re under attack.
No AI changes are involved, I simply made your faction HATE these factions so the vanilla AI will attack them. Doesn’t currently cover any mod-added factions.
I don’t currently have walls up to verify this, but I believe this would also prompt turret users to fire on sight.