All of the people talking about “other methods” like crockpots don’t realize how hard they really are. First, nothing is pre-assembled, or even-pregathered. You have to buy a lot of other parts that don’t come together very well, going from place to place to do it. Then you have to put stuff together at great personal risk (don’t read the directions right, fumble-fingered, stuff a little past its sell-by date, too impatient) then yo might not live to set things down in a selected spot. Not to mention other methods allow easier escape. Five people died at the Boston Marathon-10% of the Pulse club because many would-be victims were far enough away to run or simply move. An assault rifle is pre-assembled and easier to use-no planning needed. Also, since Tim McVeigh, explosives in this country have been increasingly on lockdown and available only for professionals. That is real ones-not fireworks and such.