Since you are new, I have a few thoughts. I hope they are helpful.
The DIS is different than some online crime forums. This is just a thread, not a full forum. I would say it's pretty loose here with sourcing, but still it's appreciated when someone gives a little information about their source. (Book, TV show, other forum, etc.)
If someone is pondering something they themselves have thought about, it helps when someone says: I have a theory, or my theory is, or I think....
It keeps the discussion going without other posters having to backtrack and figure out what's what.
Posts are going to be discussed. Some people are going to agree, some won't. It's not personal. People are going to look and see what they think fits with other facts, other theories, the timeline, and their own ideas. It's how we respectfully share and learn.