You could please elaborate?

Usually, if someone makes a valid opinion which goes against the opinions of some of the monastery residents, she will get down voted. More often than not, if said someone's opinion is valid, she will get up-voted and those tend to balance themselves, but this tendency isn't definite, so a post that reaches low negative votes might be suspected to be trolling, but it also might not.

For instance, messily-formatted posts tend to get heavily downvoted to a point of double-figure negative reputation. Also, when a debate becomes engaging enough, or appealing enough for many people, the reputation tends to be high in both directions.

One way to handle this would be to add a description to the vote, slashdot-style. You could then look out for posts that are marked as flame or troll, questions is, whether such a system could be implemented here...