Semantics. It all comes down to a player did not use good judgment, would not listen to reason, got upset because the event was 'paused' while a compromise was worked out, defied a direct order by GMs to not take any items, willfully destroyed (either directly or by instigating the action) data created by others that can not be easily replaced, insulted a Dev, GM, and other players who were trying to reason with him, then created a new character with a foul name to willfully break the naming rules and further insult the GMs, and finally told people he was going to pass out keys to other guildhouses to random players in secret as retribution for the GMs ruining his 'RP'.
That is not common sense by any definition of the word. Yes, it should not have happened. You should not have lost a friend. However, the blame rests squarely on one person's shoulders. That person is now having a time out.
My definition of 'common sense'? Don't do anything stupid. That rule was violated.