"Doublethink means the power of holding two contradictory beliefs in one's mind simultaneously, and accepting both of them."

- George Orwell, "1984"

Stallman, like most of us (and nearly all prominent historical figures) can posses both positive and negative traits simultaneously. The good isn't always outweighed by the bad, and vice versa.

Nuance is a difficult thing sometimes...

I think this isn't doublethink at all. I agree on the latter point.

In some contexts you do have to consider both, i.e. there are some loonies in every corner but the actual philosophy behind cancel-culture isn't necessarily a bad one of it wasn't the focal point of an extremely violent culture war and being aggressively pumped by social media not designed to encourage introspection or even basic humanity in its participants.

This isn't doublethink, because "he's weird and unpleasant" and "he has insightful ideas" aren't "two contradictory beliefs".

One can simultaneously be a genius and a misogynist. To some people, the former is unacceptable so long as the latter exists.

To understand an individual can indeed be both is the doublethink.

Richard Feynman probably fits the former description at least for some parts of his life.

Misogyny was just an example. All great people (and arguably all people) have good and bad traits - particularly if you go looking for the bad.