At one time we allowed logblock for use by players... using a logblock tool you could click on a block or a chest and see who has placed it, or used it last. A request was made to allow players access to logblock once again... here are the reasons why they explained.
1. For clans, to determine who is the biggest user and non-returned of items in clan home chests. For most people that I asked this is the primary reason they'd log logblock. So trust issues in clan homes could be resolved....
2. To know who griefed you... however, for the griefer, that might not always be something they want their victims to know.
3. To report xraying - using logblock on the straight pillar downs into your chest room... however, this could have a negative impact, people would be more creative in digging to your base.. and their are the false accusations when people legitimately get your coords through other methods.
So there it is.. personally, not in favor..