See also: Nassim Taleb's Argument for Banning Semi-Automatic Weapons.
Taleb might want to consider one of the first mass murders of note in the U.S. That would be the Bath School disaster in 1927, which resulted in the deaths of 38 schoolchildren and six adults; 58 others were injured. The principal weapons employed were explosives. Someone who has studied chemistry in high school can probably put together lethal explosives from material easily available at a nearby store. Taleb, who seems to have a certain sympathy for authoritarianism, also seems oblivious to the fact — acknowledged by the U.S. Supreme Court — that the Second Amendment recognizes the right to bear arms as a natural right, i.e., one of those that individuals have been endowed with by their Creator. Like it or not, that is the law of the land.
I am finding Taleb increasingly tedious: The critic of experts is rapidly transmogrifying into an expert on everything.