I'm going to ignore the debate on scabbing, there's no point any of use speculating on the justification because AFAIK none of us are referees in Cardiff dealing with this behaviour.
Personally, if issues of behaviour aren't dealt with and problem players are repeat offending with no consequence then in my area I would refuse to officiate the leagues affected. Even if it's "just a few people" you don't want to take a game unsure if you're going to face a bad apple because they keep being put back in the barrel