There are a number of right wingers who think it was the FBI who tried to kill him. If that was the case, he would be dead. They wouldn't have used an untrained teen as their primary method of delivery, even if they wanted it to not look like or point back to them.
Saw another article that mentioned he used a drone hours earlier to scout the area. Basically he located a building that nobody was on top of that had a line of site.
