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Appearing at the height of Thatcherism , Elton 's articulate and pointed attacks on Tory excesses represented an undeniably important intervention . This was a very important intervention , a first , because it 's purely humanitarian . This led to the conclusion in many instances that there is a lack of evidence on the effectiveness of clinically important interventions . Those were very important interventions . Donald G. McNeil judiciously has a key source tell us that circumcision is not a magic bullet , but a potentially important intervention .