Mass RDM, shows a consistently bad attitude and refused to take any sort of responsibility for his actions. The first part is the actual mass RDM, the second part shows how the users affected were annoyed by it (one made an F1 and another said this was a normal occurrence), and the third part shows his bad attitude/refusal to take responsibility.
Specific rules broken:
2.1 Random Deathmatch x5 - In order to kill a player, you must have a role-play-valid reason to do so. Crossfire is not an excuse to shoot someone around the area of where you're shooting / raiding .
5.5 Shops x1 - Do not raid shops unless they have another door/fading door other than their main entrance, or have raidable entities in their shop.
Context:
2.1 Random Deathmatch - There were multiple, very clear cases of RDM.
5.5 Shops - He used the fact that there was no RP House sign as an excuse, but even if it was a valid raid, he still RDMed multiple people near it.