If i kill some guy out in the woods and nick his gold they arnt going to know it was me, its not like their gona call in CSI and question all the players.

Open pk should be for outside city areas, it would actually create reasons for being in a guild saftey in numbers essentially without pk its like running around in god mode people cant hurt you, they could be tried their best to role play doctor evil yet have to ask premission to their victims to perform evil deeds.

Law inforcement can be handled by people guilds, instead of faking order have people enforce it.

Well just have the cities as safe pk zones, along with sewers and arena, that way people are free to hang around the saftey of the city they still have access to monsters and stuff to make money and improve their characters.

Places like the ojaroad could be pk zones, its open so you can go avoid people or just run from them, these places should also have the biggest rewards loot to be had. This also encourages guilds as to get to other cities and such saftey in numbers is away to go.

If groups of people establish them selfs as a dominant group and exert their force on people, well then the people just have to form a bigger group and remove them