Because he was responsible for "collecting information about Chinese attitudes, and reporting to the US government to determine American policy toward China," his subjective views naturally affected policy.
由於身負「蒐集中國民情、匯報美國政府，以決定美國對華政策」的重責大任，情報「把關者」費正清的好惡、主見，自然有著影響決策的份量。