Not really "attitude", more a point that you can't have a death threat if there isn't any threat involved.
Even if I very much want Trump to be put into a coffin and burned to death - which I didn't say, but I'm entirely happy for it to be interpreted like that - it's not a death threat without any threat. Saying "I really want to put Trump into a coffin and then burn him to death" would be a death threat, just not a very credible one.
Weird you're the one taking offence at this, while the guy you're interrogating over a perceived crime is making dispassionate statements and posting memes...