Well, we should include some feature where if one town/faction was to, well, lets say declare war for a lack of better words. Or if this cannot be done, perhaps have a thread for announcements. At least we would know when some would want to fight and do whatever they would like to do. I always like to think of Col as more of a Civilizations 5 game, where there can be peace and prosperity, but also war and fighting.
I agree with Swim. I've been on many different survival servers, particularly on servers with the popular mod "ICBM". This mod includes many missiles and bombs, such as nuclear stuff as well. And on anarchy servers, there are nuke holes everywhere. I mean, everywhere around the spawn. And even on regular Minecraft, largely populated survival PVP servers have been griefed a ton. Now, if we made it more organized, like as I said above, I think, although hard, will work much better if executed correctly. And plus, allowing PVP without organization will make way for tricksters and people who trick people into helping them, but then killing them and taking their stuff.
So, in summery, I think PVP should only be used in allowed wars and for solving conflicts, if both sides agree that peace is not an option. But this was my opinion, and I hope I'm not conflicting with anyone elses.