Why are serial killers on death row given a chance to select their last meal and say their final words?

They're still going to be executed (esp if they're 100% guilty, proven with evidence) anyway so what's the point of even asking if they want a last meal and if they had any final words to say? For what? What's the point of that?

Even Ted Buny or John Wayne Gacy was given that chance. Why?

Why are serial killers on death row given a chance to select their last meal and say their final words?
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