Obama is wrong about the less than 100 killed by terrorism since 911. The stat is wrong because something like the Trolly Square Mall shooting by a Jihadist is not listed as “terrorism” even though it was terrorism.
Of course one reason terrorism is thwarted in the USA is because we have an armed populace. The Draw Mohammed event proved terrorists can be taken down quickly by a steady-handed man with a handgun.
Obama was counting those terrorists that got killed in Garland as victims of gun violence.