So, Austin Texas is the perfect example of what I and countless others have been saying. If somebody wants to kill someone and they don't have a gun, they'll find a way to get it done.
Fly a plane into a building
Drive a truck into a crowd
Load a truck up with explosives outside a building
Use a pressure cooker to make a bomb
Hack em' up with a machete
And on and on and on. I have no clue what this guy's motivation was. Trying to be a copycat Unabomber? Regardless, there will always be crazy people out there.