There should be punishments for betrayal...
Similar to this:
Betray one member
Consequence: Kicked out of clan for one week
Betray two members
Consequence: Kicked out of clan for a month
Betray three members
Consequence: Automatic ban from the clan
Betray a leader
Consequence: Automatic ban from the clan
Betray a co-leader/moderator
Consequence: Kicked out of the clan for two weeks
All of these consequences could be lifted with an excuse that makes sense (Did not know they were part of the clan, recording for youtube, etc...). I think this would solve many arguments.