It's not irrelevant for generating sequences of words. Input of "that is the dumbest idea I've ever heard" and "perhaps that idea could use some improvement" don't necessarily generate the same output
Sure, and perhaps one might end up producing output more useful to you than the other, but that doesn't make either one cruel or mean, because it's only the word machine. The rules you might use when talking to, say, your dog, don't apply!