not to split hairs with a moron, but Q says "warning letter."
Furthermore, it identifies who the attack came from. How do they know that because I can think of a lot of more likely suspects - Russian mobsters, banking cartel, MS-13 thugs, the list goes on and on.
Q doesn't know any more than anyone else. He saw on CNN that someone sent a letter to a Trump and jumped right on the conspiracy freight train to drag you all along. Q said jump, and you all goose marched in unison, as I knew you would.