Conversation so far:
Who criticized Richard Pipes' approach?
Criticism of Pipes's interpretation of the events of 1917 has come mostly from "revisionist" Soviet historians.
Who was Richard Pipes?
The writings of Richard Pipes have provoked criticism in the scholarly community, for example in The Russian Review.
What was notable about his approach?
Pipes' critics argued that his historical writings perpetuated the Soviet Union as "evil empire" narrative.

Question: How did Pipes answer his critics?
Self-contained rewrite: How did Richard Pipes answer his critics?