This might actually seem like quite an out of thing for me to say, especially here on the forum.
I can think of many reasons why it is this way, but if I'd try to be plain I'd say this.
It's because the majority of the fanbase of this game consist of premature teens that barely know, or just found out about the flowers and the bees. It could also be the fact that this game is still growing and is in the making, it's far far away from something like Impressive Title if you look content wise. Many of the users could easily turn out bored and do not have much in their imagination to come up with something to do except... well.. Do weird things. This doesn't go to all users though cause I have really met some wonderful users myself within the game, but if you'd just look on the surface of the hive aye.
Also since the game is rather big, and it's not exactly optimized for monitoring the users and the freedom that is actually given within the game, users cannot simply keep themselves within the boundaries and have to be the biggest, the baddest, the worst, just to BE there.
This is not the whole truth about the community though, but it's not a lie.