I'd have no problem with televising executions. In fact I believe they should be. If we as a society are unwilling to accept the blunt truth of what capital punishment entails, then we shouldn't have it. However, charging money to see an execution? I think not. Certainly not for the purpose of making money for a private enterprise.
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I think that this would make capital punishment more of a deterrent to capital crimes. Our notion of execution is very abstract. If people saw executions, some might think twice before causing trouble.
Given that the death penalty is delivered mainly through lethal injections, I doubt it would have the impact you think it would. If, however, it were shown in a more horrific form (hangings, firing squads, or through an electric chair) than your argument might have more weight. Given what I know of our society, people would be more bored than horrified with a lethal injection -you will likely have more yawns than gasps.
I could be wrong though.....