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Philosophically, you cannot be both. At best, you might come to accept the shortcomings of the pragmatic critique, for pragmatic reasons. This would be a very Marxian conclusion.

Marxism is a tradition of thought associated with left Hegelianism, which was an opposition to right Hegelianism. Without the latter, there might not be a basis for the former.

Right Hegelianism might be weighed as a pre-condition for Pragmatism, because it reasons that contradictions will negate themselves if sufficiently pursued, whereas Left Hegelianism reasons that the pursuit is unavoidable.