All clubs should issue job descriptions to committee members outlining what should be expected of them and support it with a club mission statement.
If the prospective new committee members isn't willing to sign the job description then you don't need them.....if he does sign but makes a decision that looks like it is for his own good then you refer him back to the mission statement.
Too many are in it for their own self gratification....
Can I ask if any of the forumers would not sign a job description/mission statement document if they were about to embark on a role within a club committee?