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There is in fact a "red card yellow card" system built in to vBulletin, and a user getting infractions can be automatically penalized into a different user group or banned entirely.
The problem is that such a system changes, and complicates, the dynamic of the forum.
Many forums offer reward systems, in the forum of up or down votes. People at such places are not honestly themselves, but are competing to win ups or downs. Circlejerks reinforce themselves with upvotes. Hive minds develop. Some are ostracized with downvotes.
Imagine the internal politics that could develop. Imagine a Cellar Red Card Bannination Crew, working in consort. We'd have discussions breaking down into which user got close to making a heretical statement, and what penance they should offer to make things right. It'd be uglier than it is now.
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