I'm just curious because I know a lot of them rape, but honestly I view it as them trying to preserve their species. (Most humans wouldn't even think of marrying an Oomukade for instance, so finding a husband would be incredibly troublesome.) As bad as this might sound I would imagine humans would do the same thing if the tables were reversed and the only way to obtain offspring was to mate with monsters.
Also just for the record, no I myself would never do something like that nor do I endorse it, but in my mind, I can at least understand where they're coming from so it's not nearly as bad. I would also be willing to bet that the monsters would calm down a little bit once there was a steady supply of men and monster x human becomes the norm. Then again maybe I'm just biased...
Am I the only one that feels this way, or...?
P.S. Nureonago and Kraken all the way!!!