Hi, Generally speaking, I agree with you. To me. 'you don't want to' often carries the implication that, if you go ahead and do something, you are going to regret it.
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But this young man's name happens to be D'Artagnan, who replies, "yes, I do! You sir, tell me what you are smiling at, maybe we will laugh together!"
eg A young man in a bar comes to invite a pretty girl to dance. Her very large, heavily tattooed, motor-cycle-gang-member boyfriend smiles and says to him, 'You don't want to do that'.