Terrorism
Bombings
Bombings are what terrorists use to strike fear into the heart and eyes of thousands of people. When people are killed in bombings they want justice to take place. That can't happen when terrorists commit suicide bombing because they are dead. Unless they do a bombing remotely from a distance, but they could easily arrested by law enforcements. Either way a bombing is going to hurt people physically by injuries to deaths or mentally by scarring them by scary events.
Destruction
Terrorists destroy people’s property making them the "Average Joe" has to pay more taxes to have it fixed if it is owned by the city. They could also have to pay more for their insurance by having it fixed. Making them sad by losing friends and family by the destruction and by losing a lot of their hard earned money. That could cause them to become homeless which is bad for them and for the economy.
Breaking the Laws
Terrorists will almost always be breaking the law by what they are doing by if it's killing civilians, or destroying property, or selling weapons and drugs. When they break even more laws the want/bounty for them is increased mor and more. Making them more likely to be arrested or caught. Some laws if broken have greater consiquences than others like murder/man slaughter is worse than littering or speeding.