I agree with you, but you often hear people say things like 2 when they mean 3. It is often best not to take people too literally in speech, but there's no excuse in writing.
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navitasanDoes not "2" imply that there were people other than the "many people" mentioned who were involved in the building and who were helped by the "many people"?'helped' in sentence 2 is an intransitive verb with the meaning 'to be of service; give assistance.' Therefore, there is someone or a group of people not mentioned who are the builders, and it is