So if I put on a nazi blog that said something akin to um I’m going to kill all of you… Given I don’t know who they are beside username and where they are at would I be arrested? How is that different from what the 20 year old did? He was just more specific as far as I can tell.
Even saying you wish someone dead is inadvisable. It’s not illegal to say you wish someone dead but it does make you likely to be a suspect if they die under suspicious circumstances