comte buffon wrote:Would it serve as a deterrent? That is, if people knew they would be publicly ostracized, would some think twice before committing certain crimes?
Of course not. By definition, the people who've committed the "certain crimes" in question have already been arrested, publicly convicted and incarcerated* as a result of their actions. They knew that was a possibility ahead of time and were not deterred. Why on earth would being ostracized be worse? Unless by "ostracized" you mean "murdered by a vigilante mob."
* I'm assuming that anyone who's gotten themselves onto the list that these plates would go to has almost certainly done some time -- at least a week in county or something -- but I recognize that might not always be the case.