Let me answer you with some questions (I know that is rude).
What exactly is a hearthvault?
What is an exploit and how do you prove who exactly used it? Proving is something else than accusing.
What should be considered proof? Screenshots, chatlogs, videos? All of these are so easy to fake.
Which villages cheated? When did they cheat? What kinds of cheat did they use? Did all of their villagers use cheats? Or only some? If so which? Who should be punished? All of them or just those who cheated? Where is the border bteween cheating and not cheating? Is the one supplying the cheater with food so that the cheater found time to cheat and still eat just as guilty? Or do I let him go?
Have you ever witnessed what kinds of shitstorms I cause when just doing my modwork? Once I was being trolled hardcore by some member of Dis and when I banned them that led to almost a week of discussions. Do you have any idea what would happen if I made a decision about in game activities that might cause the destruction of achievements players have built over months? I am certainly not the only mod on the forums that does not only have admirers, so you probably see where this is going.
Do you have any idea how much time proper investigations would take? I personally don't have that time to spend on moderating a game for free. If the devs pay me then scratch this point.
I could continue, but I guess my point is clear.
P.S.: Before anyone starts answering every single question. The point is that there is no right or wrong anyswer to many of them.