While I do agree that some degree of griefing is part of the game, the general input and action of griefers is very useful for us, since there are definitely some degrees of griefing that we do want to prevent. Like, oh, I don't know, the building of drying frames in front of the door of every log cabin which renders the log cabin completely useless. :)
I recently got a PM about griefing, and I guess I can quote my answer to that PM here, for anyone who wishes to read it:
The way I see it is this; it is our intention to make the "evil" actions possible to perform only with relatively high-level characters (which is, of course, the reason for the Trespassing, Theft, Rage and Murder skills), thereby creating a situation where it is a real risk for the perpetrator of a crime to be killed in revenge for his actions. Our intention is that it shouldn't be possible to "just" create a couple of alts and go around griefing with them, while it should be possible to create, for example, a skilled thief or assassin given some effort.
Right now, there seem to be a couple of issues preventing smoother operation of the system:
a) The possibility to "hide" a hearth fire behind some other object thereby making force summoning impossible, which will be fixed at some point, but it's a bit tricky.
b) The inability of containers to check for the Theft skill; or differing between just illegally "checking out" an inventory and actually stealing from it; and other similar issues (which is due to a problem with the current implementation of inventories, which will be fixed).
c) The fact that plants don't check for the Theft skill for harvesting, which will be fixed.
d) Maybe the black skills are too cheap currently? (It should be mentioned at this point that the skill system will likely see a major overhaul at some point, but it is uncertain just when and how)
(Of course, any part of this should not be construed as if it were a definite future plan of ours, since it may change at any time without notice (maybe I should make that my forum signature))