I've read your comment twice, and I can't make heads or tails of what you're trying to say.

> If some CEO spoke unflatteringly of The Red Cross or Habitat For Humanity,

Those are organizations. "Antifa" is a descriptive term that many people and organizations use, whether they have connections to one another or not. What is the comparison you are trying to draw here?

> If Antifa’s record speaks for itself, then you don’t need to play these kinds of word games.

You are using the possessive here, "Antifa's", in a way that seems grammatically incorrect to me.

"Antifa" is usually an adjective, but sometimes a known, like "vegan" or "blonde". Saying "if blonde's record speaks for itself", it seems like obviously broken English.

Usually you'd use this phraseology to describe a person or organization, "Joe's record", "Nabisco's record", etc.

What is the entity or entities whose record(s) you are trying to describe?