[Vynd]

If you really hate raiders, you could try playing one of the death based nations like Ermor, whose dominion kills off all of their population. No population equals no supplies, so its much more difficult to raid these nation's territory. That's not to say it can't be done. Just that it is more difficult and costly, especially if the raiders want to head deep into your territory instead of staying along the fringes where their forts might provide them with some food.

Obviously this doesn't address the problem when it comes to normal nations. But if you find raiding really frustrating then maybe the death nations would make for a more enjoyable experience for you.