hmm,isnt there a rule that doesnt allow the ruling guild to attack players?
NO, however, A guild can choose to impose such a rule, if they set their guards to stop ALL attacks. like has been done lately, to
try and protect shoppers at Dark Tree Province
As to signature looting..., let me start by saying I am a bit biased due to my guild position with them (nano), but that is not new news, if you play a lot, just check the newsletter, you will see that (only my approximation and based upon NOTHING) about 90% of all looting are made by signature members, or their many double accounts and sub-guilds.
That is just a part of the game, we need to accept it, or improve and try to be stronger... as nasty as it is, that is how they choose to play - and as there is no limit to the amount of double accounts you can have, this will not change.