What? Not a chapter problem? It's the same greek org, year after year--- are these offending individuals 45 years old now?
Of course it's a chapter problem. The issue isn't whether or not it was a plurality of membership or not. It was a repeated, yearly action by the same organization, with the same ugly results. 
Again, leaving sanctions to the same guys that excused this (does anyone believe this is news to the national charter folks?) is ludicrous.