Its not the range of topics its the ones that are going to bring out strong feelings that are bound to morph into heated debate that causes arguments and bad feeling. I just looked through the TOS and it says:
Posting Topics - Avoid topics about race, politics or religion. These can be very sensitive topics and it can be very easy to take things the wrong way, creating arguments.
- Please keep threads on-topic and avoid spam or "chit-chat" within the specialised forums. The "General Chat" forum should be used for all off-topic posts that don't belong in the specialised forums. Off-topic means posts about stuff that isn't related to astronomy.
- "Spam" is a post with no useful content, no purpose except to get other people to reply with spam, and to increase your post count. Spam is not welcome anywhere on the forum.
- When creating a new thread, please ensure the thread title is descriptive of the content of the post.