It does:

Content that may be generally construed as provocative, divisive, objectionable, discriminatory, or abusive toward any real-world individual or group, may be subject to moderation. This includes but is not limited to content involving politics, race, religion, gender identity, sexuality, or social class. We tolerate content related to real world issues and events as long as the appropriate tag (“Real World Issues”) is used and the content is handled in a tasteful, respectful, and non-inflammatory manner. Users who do not wish to see such content should make use of our content blocking feature.

And it is their platform, that’s why they care. They can dictate what is and isn’t allowed there.