And under 4.0 ~ there is no rulee that requires your base to have a Sign that says "KOS" to be able to kill tresspassers. And if you say its a shop, you are wrong there is no building Sign neither a visible rp house Sign according to video 1. So under 5.5 Shops - he deserves all rights to defend his property or "shop" as you guys call it as its a raidable base according to the rules.
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