How terrorism works
Insightful article on the rules for it. It is only a threat if you treat it as such. In a way it is similar to how some diseases kill through the reaction of the immune system (e.g. a cytokine storm). However a warning that the rules may change in the future if bigger threats will get into the terrorists' hands.
Following an act of terrorism, the enemy continues to have the same number of soldiers, tanks and ships as before. The enemy’s communication network, roads and railways are largely intact. Its factories, ports and bases are hardly touched. However, the terrorists hope that even though they can barely dent the enemy’s material, power, fear and confusion will cause the enemy to misuse its strength. Terrorists fight like tai-chi masters: they aim to beat the rival with the rival’s own power.
Read more: Link - Yuval Noah Harari: the theatre of terror | Books | The Guardian