Why is two of the modal verbs 'would' used? This is not the same as a conditional sentence (with if ), where two would s are not correct. Not sure this actually answers your question, but there is no problem with the two of them.
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contraposition You'd think he'd have the common courtesy to apologize.Why is two of the modal verbs 'would' used?This is not the same as a conditional sentence (with if), where two woulds are not correct. Not sure this actually answers your question, but there is no problem with the two of them.
contrapositionYou'd think he'd have the common courtesy to apologize.You would think (that) he would have the common courtesy to apologize.
CalifJimThe closest paraphrase without the 'would's is:A person can reasonably expect that he might apologize as it is common courtesy to apologize in this situation.Add: but he did not apologize.