Who killed detente, and why?

The purge in Washington of anyone involved with Detente was part of a wider campaign against non-interventionist conservatives to prepare for Middle East wars, just as an earlier generation of State Department, United Nations and White House were purged as 'Arabists'.

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The Chinese and Russians did not kill detente, America did. Yet this was not uniformly welcomed among the American political elite. So who, exactly, killed Detente? Why and how?

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Comprehensive political purges in the US

We are used to thinking of ruthless political purges as being a Russian or Chinese thing.

Purges in the US are no less ruthless, but they are conducted by shaping opinion by taking over think tanks, writing books and articles, appearances on live media, and then moving the influencers into key positions of power.