You also have the option of taking over a far away flat and building a city on it. Everybody starts with the beginners/lords package, which has enough medals in it to put you at knight rank and capable of owning two cities. If you have a low to mid level warehouse, you can store enough in it to build a city, and even if you don't, the person can't possibly keep attacks against you every minute of every hour 24/7, and it takes very little time to get whats necessary to take a low lv flat and build a city.
Point of clarification: while attacking people or playing aggressively is not a reflection of real life morality, griefing is. Most griefers are, in any game, real life
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