Sounds like (purely speculation, since the details aren't available) he pulled a gun on or otherwise threatened the agents coming to arrest him, based on his other behavior. Told them to come back with a warrant, they did so, and he took issue?
Either way, posting on the internet about assassinating government officials, regardless of whether it's serious or not, was probably not the smartest opening move.
Yes the same guys who rant about government tyranny yet defend police (government employees/enforcers) at every opportunity love to also rant about the rule of law unless those rules are applied to them or their current flavor of the week messiah.
He was posting over and over on how he'd kill the prez, the veep, and Alvin Bragg for months. The one that finally did him in was talking about sniping Diamond Joe. They paid him a visit, and he got squirrelly on 'em.
Thats just the official story. What actually happened was that dark biden's Cyber-Brain picked up the threat, so he used his lazer vision while at a rally in New Mexico to vaporize him.
The media is totally censoring the thousand mile long lazer beam the president shot out of his eyes. They have the footage, but they are too afraid to tell the truth, because then the Clinton Mutant Teenage Turtles will kill them.