I suppose today Schweitzer would insert the politically correct "human"

No, he wouldn't. The citation is translated from German which already then had two different words for 'human being' and 'man' (50% of them). So he'd use exactly the same words now. But the translation might be different today.

A very great man he was, so great that his citations (and life) can be used and are used as role models for extremely opposite positions. The above citation is chiefly used by an extreme German animal rightist party which I personally consider crazy. But I also might have considered Schweitzer crazy and admired him at the same time.

Wolfgang